Re: Bendix Coils Test Good, But Won’t Fire In Motor

[jerry-ahrens]

That’s pretty interesting Steve, thanks for posting.The only other thing I could think of is an open secondary winding, but that’s probably far fetched, since the coil tests good on the Mercotronic. It might be worth checking this with an ohm meter, just to make sure. I’ve seen a couple old Johnson coils that had this happen.
I think I’d also do a surface leakage test too. Does this motor have the rubber boot that goes over the solder joint on the coil? The reason I ask, is that I have an Oliver motor (with bendix mag) that does not have the rubber covers to seal the secondary (spark plug wire) solder joint. When the motor is cranked, the spark will jump this open gap to ground, rather than firing the spark plug. The Oliver coils originally had the spark plug wire built in to the coil from the factory. It was just molded right into the coil. The new coils of course, require the wire to be attached or soldered . I need to get a couple of these rubber covers to fix this particular motor. If I remember right, mercs have some sort of rubber boot or cover here I think? Just a few things to consider…