Johnson TD-15

[Aidan Smith]

Working on an earlier TD-15. I have gone through the whole ignition with new condensers, plug wires, and cleaned the points. I have been told the coils are usually OK on these. I have excellent spark on the bottom cylinder, but I do not have anything on the top. Is there an easy way to test the coil, and if it is bad, is there anywhere that has NOS ones? I’ve looked on eBay with no results.

 

Thanks!

"Shells sink, dreams float. Life's good on our boat."
1921 Elto Light Twin F
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1959 Mercury Mark 6A

[JOSEPH BRINCAT]

A rudimentary test of the coils can be done with the Volt – Ohm- Meter ( VOM). Check resistance between the spark plug wire  plug connector and ground on the engine.  Reading will likely be in the range of 4500 to 6000 Ohms.  If you get an open (infinity) the coil or the wire is most bad.  If you get an open, next step is to do the same test at the coil spark plug wire connection.

Joe B

1 user thanked author for this post.

Sam M.

[JACQUES]

just compare bad to good …should see something different   if not look elsewhere… or swap things    one a a time only 

try cleaningthe points again.

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