Johnson TD 20 1946-1949

[Mike M]

Can anyone give me some direction on what replacement coils to use for a Johnson TD 20.. any hep would be appreciated

[frankr]

Are you sure you need to replace them? Those coils are almost bulletproof. 375189 Listed as NLA but there should be lots of used ones out there.

[todd281]

try this link : https://nerp.net/~legendre/johnson/Johnson%20TD20%201946-1949%20parts%20manual.pdf those coils rarely go bad however I would check them out and eliminate all other things first. [especially the points] as I remember I believe those coils can be rebuilt with not allot of trouble. seem to remember seeing a website explaining how to do it. As they can be rather hard to find.

[frankr]

Like I said, lots of used ones out there. Here’s two of them for 25 bucks (not mine)

https://www.ebay.com/itm/GALE-SEA-KING-GOODYEAR-OMC-5HP-IGNITION-MAGNETO-ARMATURE-PLATE-OUTBOARD-MOTOR/323787893594?hash=item4b63432b5a:g:sh8AAOSwSv9cwJS4

[Mike M]

Thanks for info.. I have no spark in upper plug when using plug tester.. lower plug sparks great.. I switched the condensers and still no spark at top plug. I guess I will switch coils and see what happens with upper plug before I replace. Could it possibly be anything else? Thanks again

[Mike M]

I have spark in one plug and swapped condensers around with no luck.. I will swap good coil and see if it sparks.. what do I need to do as far as points just clean or replace? Thanks for all your help

[frankr]

I maintain that at least 90% of the time, dirty breaker points are the no-spark problem on those. Take the points completely apart and de-grease and polish each contact individually. Reinstall and set gap to 0.020″. Do one set at a time so you have a sample of how they go together, and don’t lose any of the little insulators.

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