How to test a coil in an antique outboard engine

[rebelliouseoagj]

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[chrisry1995]

All coils have 2 windings. The low resistance,low "turn" primary winding is connected to the ignition module or points and ground. This winding colapses and induces a magnetic field to the secondary, high resistance, high turn, small wire winding connected to the spark plug and ground. Check between spark plug wire and ground for around 6000 ohms plus or minus 1000 on MOST ignition coils. Some coils will work until hot and fail. Small wire heats up inside and shorts. Look for cracks.

[MrJasonduval]

hi sir thanks for your vidéo it did help me a lot, one thing i dont know is that i have the exact looking coil you have in your hand the green one does it fit on my 1963 mercury 9.8 model 110. im trying to buy two of them but cant find it.

[BSDenning0116]

I have a 1974 20hp Mercury and I want to test the coils. Will this procedure work for testing coils on non-magnito ignition systems? 

[chrisry1995]

@BSDenning0116 Yes

[SnapDaddy5998]

How do you remove the steel cover that covers the coils underneath the pulley? I have a 51-52 elgin and trying to get to the coils to replace them.

[cpgixxer]

@SnapDaddy5998 Use a flywheel puller with the appropriate grade 8 bolts.

[Jumpinjacks1]

Hi, Does anyone know whether a multimeter would work? As I can't find a cheap ohmmeter anywhere here ( UK ). I see the multimeter measures in ohms but doesn't have the 1000 resistance setting, but would the 2000 setting work just aswell? how many ohms should the outcome be?

[chrisry1995]

@Jumpinjacks1 His is set at X1000 and he said it read 6 ohms, he should of said 6000 ohms. You must multiply your reading by the scale you set. Digital meters have the" HIGHEST resistance it can measure" number settings 2000 will not work because you need to measure 6000. Switch up to next scale..20K or 20,000 ohms max. The readings WON"T be EXACT! It'll display 6.00 for 6000 ohms on the 20k setting. but 5.70 or 6.32 is fine also for example. Most DVM's will work fine for this.

[MrBFHfan]

und was bringt uns das jetzt?

[62river]

Look at Laing's outboards for parts or discount marine parts com for elgin parts

[peg12121212]

awsome video!!! i learned a shit ton in 8 min! you fix my problem buddy THANKS ALOT!!!

[Golfferdie]

Doug great video, I knew many years back how to do this a forgot over time and being out of the industry. Just a thought, I live in FL and down hear you get petty sweaty and if your sweaty and touch tne leads to the meter it will read what the resistance is between your fingers. Try not to touch leads as it will give a false reading.

[rasalas2x]

Doug, I really enjoy your lectures on OB repair. You do a wonderful job explaining so that many more can learn and enjoy the art of the old outboards.  Thanks and keep up the good work!!

Rob

[seanyboy150]

brilliant! i've spent the past 2 weeks scratching my head trying to figure out what was wrong with my mercury 7.5hp! after watching this video i borrowed and ohm meter and within 2 mins managed to determine that the secondary circuit on one coil was dead. cheers doug for the video! i nearly took it to a garage, at £40 an hour labour your video has just saved me a lot of money!

[RELLIKREED]

I am having a problem on a Mark 25. had fire in plugs removed and cleaned points reinstalled was carfull in the install but now have no spark. checked the coils with the help of you video, all is good but still no fire. what about the condencer? would this cause no fire or how do you check that condencer to see if is good? Any info would be greatly appreciated!!!! THANK YOU

[rustyreks]

Doug got a ohm meter and checked out the old coils as you described it seems most of the coils are okay but most of the condensers are shot simple fix with old lawn mowers is to chuck in a 12volt car one it means i can speed up the process that was an issue before with your help i got a mower going tonite hasnt gonme in years was having problems with the electrics so your tips certainly helped regards brentnz fixing it for a friend regards brentnz

[rustyreks]

Doug i have been wondering how to test coils on my vintage mowers recently fixed an old seagull motor that was seized electrics okay have been having problems with some of my other engines that is coik related thanks so much for sharing nuch appreciated all the best with your vintage engines i will pass your info to others as well regards brent nz

[issacteamster]

i test out my coils the easy way my girlfriend holds the sparkplug wire in one hand the ground in the other i turn over the moter if she screams it works if she screams and swears at me it works really good-high voltage --no response coil is broken

[jajaid6]

hahahahaha!

[Icycoldcoke]

thanks alot very info i will use it on mowers

[alectraproject]

10/10 Mate!