Mercury outboard no spark troubleshooting. this is the first thing I always do.

Mercury outboard no spark troubleshooting 1999 Mariner outboard 60 hp serial # OC213904 2 stoke 3 cylinder. 2. use a remote starter to see if you have spark nowcommon problem and people go out and replace stator's, switche boxes and everything in between. Early 90's. Jan 28, 2025 · Solve Mercury outboard problems with our expert guide. Though this advanced, compact Mercury outboard motor offers EFI that no other outboard or boat manufacturer offers at this horsepower rating, often users experience some troubleshooting issues while using it. The stator shows resistance between both wires and each wire to ground. May 16, 2011 · Re: Mercury Mariner 90hp no ignition spark help check for a fall overboard kill switch and if you find it make sure its engaged to fire. If spark switches cyl's then the trigger is bad, if it remains the same the switchbox is bad. net, John will guide you through troubleshooting an outboard that won’t start by address 2012 MERCURY OUTBOARD 115HP 4 STROKE EFI. Your 88 should have oil injection make sure your getting nice blue color when starting. I will get the serial number tomorrow it’s one of the older ones with points. I follow the testing procedure that I found on outboardignitionsystems. A bad harness connection or bad harness. 8hp that has no spark. This comprehensive blog post Mar 28, 2023 · So, beside a less spark, no spark is also a sign of a dead or damaged outboard coil. The 4-stroke outboard engines, in particular, provide boaters with dependable power, smooth operation, and excellent fuel efficiency. GROUND FOUND WITH This 45 hp Mercury lost spark on all four cylinders. No spark in a 2006 Mercury 25hp EFI 4-stroke can stem from a faulty ignition coil, CDI unit, or spark plug wires. If you adj carbs rich is better than lean. Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds - BBC Sponsor magcat Member Join Date May 2, 2024 · Mercury Outboard engines are known for their reliability, but sometimes they can have starting issues. In this video we show you step-by-step how to diagnose and repair a no spark condition in a Mercury outboard engine. Examine fuel lines, spark plugs, and carburetor. Using the leads supplied make the connections. A bad . Replaced spark plugs, nothing. It also has a stator made by CDI electronics on it. disconnecting the engine harness to the motor is an easier way to see if the problem lies in the key and throttle areas. Mercury outboard mechanic. Known for their reliability and performance, these engines have become a popular choice for boating enthusiasts worldwide. Also noticing some gas sitting at the bottom inside the This is part 2 of diagnosing a 2-stroke Mercury 15hp outboard. . No spark on one bank (port or starboard): Likely a stator coil, switchbox, or related wiring issue for that side. Mercury outboard motor problems can be frustrating, not to mention the hefty costs of professional repair services. Below is a quick list of items which can cause a "no spark" condition from the coil: 1. This guide will help you troubleshoot frequent issues and get your engine running Feb 24, 2025 · The issues with the Mercury 50 HP 4-stroke outboard engine are with the fuel system, spark plugs, oil, and more. How do you read the fault codes on a Mercury outboard? What do the beeps mean on a Mercury outboard? Get all the answers! No spark in a 1978 Mercury 150hp outboard can stem from a weak starter amp draw affecting ignition. Feb 24, 2025 · Common Mercury 75hp 4 stroke problems The Mercury 75hp 4 Stroke is an engine system that provides maximum performance, power, and reliability. If the Jun 4, 2023 · Inspect and maintain electrical connections and components By addressing the common problems mentioned in this blog post and following proper maintenance procedures, you can ensure that your Mercury 90 HP 4 stroke engine continues to offer the performance, efficiency, and reliability you’ve come to expect from Mercury Marine outboard engines. Symptom 5: Burning Smell When the coil of your Mercury outboard is having some problems, you usually smell it before you see it. Lots of work went into this one due to various failed incorrect ignition components and ALL of Jun 23, 2025 · This guide aims to demystify the process, empowering boat owners and marine enthusiasts to troubleshoot ignition problems confidently, potentially saving significant time and money on professional repairs or unnecessary parts. Ran great then stopped and hasn't started since. Since trigger and stator were replaced, inspect the ignition coils and wiring harness for corrosion or damage. Working on a 90hp mercury outboard engine. I have a 1999 25 HP Mercury manual start outboard. Is this the problem or is that normal? Where is the best place to start? Thank you very much for any help. Another important episode of outboard care that can save you tons of hassle on the water; Get to know your outboard, the knowledge learned will make everyda How to diagnose a no spark on an outboard motormore Audio tracks for some languages were automatically generated. Could you let me know if this issue started suddenly, or has it been developing over time? Customer: Developing over time but now consistent Mechanic's Assistant: Thanks for sharing that. Just check that the lanyard is still in the safety switch No spark in a 1990 Mercury 60 HP outboard with CDI usually points to a faulty stator or ignition coil. <br /><br />If you have disconnected the blk/yel wire and now have spark, the switch box is good. Mechanic's Assistant: That sounds frustrating. No spark in Mercury outboards after winter often stems from faulty ignition coils, trigger, or stator. I think the stator is my problem but I’m not sure. 26K subscribers Subscribe A discussion of outboard motor starting problems, some of the causes and quick solutions, aimed at non-mechanics. Learn the top causes and how to fix common ignition, fuel, and electrical issues. Click to learn the symptoms to detect mercury outboard bad triggers. I hooked the two yellow wires together to bypass We would like to show you a description here but the site won’t allow us. Whilst I am always happy to try and help in diagnosis, it can be very hard to do so over the phone. 1. Troubleshooting these problems can be complex and require the right tools and knowledge to diagnose and correct them. Feb 24, 2009 · I have a mercury 25hp 2stroke outboard circa 1988 what wont spark, not sure what to check next, help! tested the wires from the stator and trigger to switchbox, Im only able to check static readings as its a pull start & I have no peak reading meter just a standard multimeter set to ohms. Eeeek! If your Mercury Outboard engine won’t start, here’s a step-by-step guide to help you troubleshoot the problem and get you back to safe waters real soon The outboard motor may be emitting excessive smoke as a result of a number of problems, including a filthy air filter, fouled spark plugs, or a blocked fuel filter. Sep 1, 2009 · Re: 25 HP Mercury no spark. Is the Stator, Trigger, Switch Crank the engine and check for spark. That’s no good if you’re 3 nautical miles offshore! Or worse – at the boat ramp where everyone’s watching the commotion. In this section, we will discuss fuel system problems, spark plug troubleshooting, propeller issues, and engine power and acceleration problems A lack of spark in an outboard motor can be caused by a variety of issues, including a faulty ignition system, weak battery, fuel delivery problems, and damaged flywheel key. I had just had the boat out of the water and did a water pump service, lower unit oil, and new plugs. Customer: 2001 Mercury 200 HP Outboard weak or no spark. Check that the kill switch is in the run position. 2 cycle model # oG20073 . Is there any recent maintenance or changes made to the outboard before this issue became consistent Aug 17, 2010 · Re: 120 force mercury outboard engine starting problems i have replace my battery with a brand new battery but the engine just crank / turns but doesn't fired up. Still consider myself a " Marine Apprentice " after 48 years (learn something new every day). May 18, 2009 · Re: mercury 15 hp no spark? You may want to post the year of your outboard for better results. What Does an Ignition Coil Do in an Outboard Motor? #paffordHomestead #MercuryMariner #Mercury Work on my 1996 Mercury Mariner Trouble Shooting No Spark I'll show you how to trouble shoot it, not hard once you Run through a checklist for problems specific to Mercury and all outboard engines to help troubleshoot and fix any issues the motor might have. Apr 25, 2021 · Quick video on the steps to identify a no spark issue on a 25hp Mariner. I don't know much about the motor except it was clean and stored indoors for years. May 11, 2024 · The Mercury 25 HP 4-stroke outboard, known for its reliability and compact size, is a popular choice for smaller boats and weekend getaways. Special guest appearance by @ForesightFi Aug 22, 2018 · Trying to check this coil out because of starting problems --got no spark on either cylinder, and have checked and eliminated wiring from the picture, Jun 28, 2025 · Learn advanced troubleshooting techniques for your Mercury Outboard engine. And it did not. Use a jumper wire and short the orange (Salmon) wire to ground. In some cases, the engine may crank slowly but still fails to start over. 5V FOUND WITH COIL DISCONNECTED. No spark in a Mercury outboard typically stems from faulty ignition coils, bad spark plugs, or damaged wiring. Tried a new plug in both plug wires and nothing in either. Jan 30, 2025 · No spark on all cylinders: Likely a stator, trigger, or rectifier issue. Aug 11, 2005 · Help, I have just encountered some type of ignition failure on my 1995 25 HP 2 cycle Mercury outboard 0G153788. May 12, 2025 · Outboard motor problems typically arise from one of three systems: air, fuel, or electrical (spark). Mar 26, 2021 · Hi, I’m working on a old Mercury 9. Apr 12, 2013 · Re: 90hp no spark on #1 Since there is NO RETURN on electrical parts it is important to properly TEST before spending your money. 20 Hp Mercury - (Part 1) Troubleshooting this “No Spark Condition” livetofish Outboard Repair 5. 8 hp Mercury outboard motor, possibly a model 110. A blown ignition fuse. 5. Your 2004 Mercury outboard with the serial number 0T951840 is experiencing a no-spark condition, meaning the engine isn’t generating the electrical spark needed at the spark plugs to ignite the fuel-air mixture. Quickly determined that there was no spark on either plug. Troubleshooting these systems can be tricky without proper guidance. Motor started up as usual took out on a slow cruise and 10 minutes into the ride at Apr 25, 2023 · Mercury Marine is a leading manufacturer of high-performance outboard motors, including the popular Mercury 20 HP 4-stroke model. After a reasonable run at normal cruising speed (20 min @ 3500 - 4000rpm) and a bit of a drift for 5 or 10 min I couldn't restart it. May 30, 2004 · Re: 25 hp Mariner, no spark! Switch problem? fishguts,<br /><br />Firstly, thanks for all the right info and the checking you've done up to now. Learn about unusual sounds and excessive vibration. Check the spark plugs, ensure there is enough fuel supply, and perform a compression test to identify the root cause. So, before venturing out, let’s dive deep into the most common problems Mercury 25 HP 4-stroke owners face, and explore May 29, 2009 · Re: 1999 mercury 125 not firing on 2 cylinders If you are testing for spark and found no spark on 1 & 2, First, switch coils to see if the coils are the problem, then switch the trigger wires on the switchbox and retest. However, like any other mechanical device, Mercury 4-stroke outboards might face occasional problems that require troubleshooting and fixing. Here are several steps to troubleshoot and fix the lack of spark in a 1965 Mercury 50 HP outboard motor: Inspect the Spark Plugs: Remove and examine the spark plugs for any signs of wear or damage. 4. Engine fired right up but died after 30sec. Learn more Feb 5, 2017 · I recently received a 90 hp mercury, 3 cylinder, year 88. As this switch essentially earths the output, hence no spark. Hopefully this video helps someone. Despite its reputation for quality and reliability, like any mechanical device, the Mercury 20 HP 4-stroke can experience problems from time to time. A faulty Shift Interuptor Switch on the shift The Mercury 115-horsepower outboard boat motor requires consistent and regular maintenance to run efficiently. I appreciate the support. Nov 4, 2022 · mercury 4 stroke efi problems Regarding reliable outboard units, mercury is one of the most popular options across the nation. Let’s discuss the common In this video I go through testing the CDI ignition on and outboard motor to diagnose any faults such as a no spark situation. A no spark issue cdi was For no spark on a 35hp Mercury outboard, first inspect the ignition coil and spark plugs for damage or corrosion. Sep 14, 2010 · Re: Newbie with Mercury 115 problemsIgnition switch and no spark Simple landyard switch to on position? Make sure on outboards that your getting right mix of oil to fuel. The most common sources of problems are the internal water passages, the fuel line, propeller and spark plugs. CDI Electronics has a most excellent Troubleshooting Guide (for free) CDI Electronics Practical Outboard Ignition Troubleshooting Study the section on the late model CDM ignition, it will spell out exactly how to test the wiring to determine the faulty component Oct 23, 2013 · Mercury 115 In-line; No Spark - Moderated Discussion Areas Hop to: Aug 4, 2023 · This article aims to offer an in-depth look into the most common problems you might encounter with your Mercury 40 HP 4-Stroke engine. Begin by inspecting spark plugs for wear or fouling and replace if needed. Hey guys! I have a fairly straight forward diagnosing process for diagnosing the no spark on these switch box years of Mercury. Jun 12, 2025 · Troubleshooting tips for Mercury outboards that won't start. Outboard engines, like Jim’s Mercury 125 EFI, require a precise mix of air, fuel, and spark to operate smoothly. Like any marine equipment, these outboard motors experience problems from time to time. Nov 4, 2011 · Before you go too mad, the problem in my Tohatsu was the "deadmans switch" which was well . They seem to be one of the more common motors to have issues Aug 18, 2024 · The most common thing I get asked over the phone to assist with is diagnosing outboard ignition problems. Jul 25, 2008 · Re: 1996, 3 cyl, 60 HP, No Spark any cyl ???? If you bought the correct adapter for your ohm meter then simply plug it into your meter, set the voltage scale to AC and the range limit for the tests outlines in the CDI Ignition Troubleshooting Guide. Would this eliminate the kill switch and the neutral safety switch? 2) I checked the OHM readings for the stator and the trigger and they were both about 5% lower than the CDI Test instructions listed Jul 23, 2022 · 3 Common Mercury 4 Stroke Outboard Motor Problems: 1. Please refer to the Troubleshooting guide for OMC power packs and CD's item #8. However, like any mechanical piece of equipment, there might be problems … Mercury 40 HP 2 Stroke Problems Jan 21, 2017 · This troubleshooting guide will help you diagnoses a Mercury outboard engine that won’t start. We would like to show you a description here but the site won’t allow us. If you have no spark, there are several things which can be at fault. Check the kill switch and wiring harness for continuity and secure connections. Some users have also claimed that sometimes the motor starts after several tries but quickly Dec 13, 2023 · When it comes to troubleshooting a Mercury 2 Stroke Outboard, it’s essential to know the common issues and their solutions. It brings a complete range of options, from smaller boats to bigger units. Nov 6, 2013 · Re: Mercury 80 hp ignition problems Ok, trim all good replaced a section of wiring that was heavily corroded that was stopping the trailer button from working, and have spark on all cylinders but think now its a fuel issue ;/ drained tank and replaced with fresh fuel/oil mix, im assuming there are rebuild kits for the carbs and fuel pump? Jun 13, 2016 · I've got a problem with the engine. I've removed the flywheel and cleaned the magnets, and I can read a DC voltage output when No spark in a Mercury 125 outboard usually stems from faulty ignition coils or damaged stator wiring. From starting issues to unusual noises, these hiccups can spoil your day on the water. But keep in mind that there could be more than one cause for why a Mercury outboard fails to start up. A bad key switch. Dive into compression testing and analyzing engine diagnostics for optimal performance. someone pls help Mar 21, 2008 · Re: Mercury 150hp V6- No spark on one side Have you removed the bias wire between the switch boxes or the yellow wires from the rectifier, both can cause a problem like you have. One day it was working fine, the next nothing. This is part 1 of a series of videos I am putting together on how to diagnose and repair a small 2 stroke mercury outboard which has "no spark". Tested kill switch and it was fine. So today I plugged in the harness to see if it got spark. May 12, 2025 · Having trouble with your Mercury 60 Hp 4 Stroke outboard? You’re not alone. In this guide, we will go over some potential problems that could occur with a Mercury 50 HP 4-stroke outboard engine and ways to fix them. Proper winterization procedures will also do wonders to prolong the life of the internals of your outboard. Specifically Mercury step by step knowledge on how to check each component of the electronic ignition. this is the first thing I always doThey take off the yellow charging wires to eliminate the charging circuitthen you need to start testing 2 days ago · Using proper grade of gasoline and outboard oil is essential to preventing internal problems. 1) I disconnected the Black/Yellow wire from the harness to the switch box to override the Kill Switch and still no spark. com. dead, hence no spark. Replaced switchbox/power pack - still no What do you check if your outboard has a spark but won’t start?In this installment of our series on your outboard ignition system, we’re going to guide you t Mercury 30 Hp EFI 4-stroke troubleshooting: The main problems and ways to fix it So what if your outboard won’t start? In this short video from Boats. Begin by inspecting the spark plugs for fouling or wear, then test the ignition coils with a multimeter for continuity. The owner wants it fixed and asked me to diagnose the problem and fix it. Whether you’re dealing with a 70hp Johnson or a 175hp Mercury, this guide will help you identify and resolve coil-related issues effectively. Seems like a very Mercury 60 Hp EFI 4-stroke troubleshooting: The main problems and ways to fix it Mar 17, 2012 · Re: 40hp, No spark Pull yellow and black wire off the switch box to eliminate your key switch. Mar 11, 2025 · Troubleshooting Noise and Vibration in Mercury 4 Stroke Outboard. Jun 2, 2023 · Mercury outboard engines are renowned for their reliability, durability, and performance. 3. you will start to have a burning smell when you start the engine. Understanding common problems and their solutions is essential. May 30, 2023 · If your Mercury outboard is cranking but not starting, the issue could be with the ignition system, lack of fuel, or poor compression. Plug wires attached to suitable spark tester or grounded, key ON or harness unplugged, hit the Jun 4, 2023 · The world of outboard engines is vast and filled with numerous brands and models, but one that notably stands out is the Mercury 40 HP 2-stroke engine. Mercury 15 Hp 2 stroke troubleshooting: The main problems and ways to fix it May 23, 2007 · Need some motor help. Open type timer bases:When all cylinders fire with the spark plugs out, but one or more cylinders quit when the spark plugs are reinstalled, regapping the timer base may solve this problem. Many boat owners encounter problems that can be frustrating and time-consuming. No spark on a single cylinder: Likely an issue with the ignition coil, spark plug wire, or spark plug. It gets quite frustrating on this forum trying to help people who say "My motor doesn't work". Has good compression on all 3. I will kee Dual Mercury Master Technician - for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC. However, even the most dependable engines can encounter bumps on the water. Includes an overview of the 4, 5 and 6 HP Tohatsu / Mariner / Mercury motor, basic Customer: I have a 9. Mechanic's Assistant: Have you experienced any engine issues prior to this? Is there a specific trouble code or any warning lights illuminated? Customer: No, I haven't used this motor in several years, and I'm not getting any spark. I have a 2010 6Hp Mercury (Tohatsu) with no spark. I did some more troubleshooting last night. In this article, I Troubleshooting an Outboard Ignition System If your outboard has a spark but won’t start, there are several troubleshooting tests you can run to find the answer to the starting problems happening with your motor. Jun 25, 2024 · We’ll also discuss related spark plug problems, other ignition system issues, and maintenance tips to keep your outboard running smoothly. Check the ignition coil, points, condenser, and spark plugs for wear or damage. Identify common issues and learn how to fix them quickly and effectively. Troubleshooting these issues can help get your outboard motor back up and running. Aug 1, 2024 · To troubleshoot a Mercury 2 Stroke Outboard, check the fuel system and ignition components first. May 10, 2025 · Mercury CDI ignition systems are crucial for your outboard motor’s performance. As far as the regulator follow the wire harness that come from underneath the Apr 19, 2024 · Would anybody here have Mercury technical knowledge regarding a no spark condition on a 1992 merc 8hp. No spark in my mercury 1999 2 stroke 3 cylinders outboard. NO SPARK AT COIL PACKS 2. First, test the stator’s resistance and continuity using a multimeter. First time startup this spring. It is a highly advanced system, but like all electronics and computers, there are times when problems occur. By understanding these problems and their fixes, you can ensure that your outboard engine operates at its optimal level. what is going on. Begin by inspecting spark plugs for fouling or damage. Mar 28, 2023 · Are you facing problems with your Mercury Outboard engine? A bad trigger can be a reason. Feb 25, 2012 · Re: Mercury 25 hp efi no spark Some times motors are put in storage and for some reason, the red tether cord is removed. Nov 5, 2007 · Re: 60 HP Mercury/Tracker No Spark? There is a very good chance the your engine has a bad stator, thats why most mechanics test with a DVA an OHM meter just won't show the type of problem your experiencing so you are at the point of having the system tested with a DVA of taking a chance on the stator and changing it. Dec 28, 2023 · Known for their superior horsepower range and efficient engine performance, it’s undeniable that Mercury outboards are leaders in the industry. Jul 23, 2022 · The Mercury 25 HP 4 stroke outboard motor model delivers constant easy starting, crisp throttle response, maximized fuel economy, and overall outstanding performance. Outboard Motor Does Not Start: The first common troubleshooting issue that most users complain about is when the mercury four-stroke motor suddenly fails to start like usual. May 22, 2016 · Doesn't appear to have any spark. fqnv czugdy fay qqlq hjcdpj gbndy aufovv vxujlr xqb salskz squxd lalbt cqhr ois smis