Home › Forum › Ask A Member › 15 Evinrude 1975 no Spark Driver coil ? › Re: 15 Evinrude 1975 no Spark Driver coil ?
Did you check the resistance of the driver coil and be sure it is NOT shorted go ground? Typical resistance is several hundred ohms. A bad driver coil would surely kill both cylinders, but the driver coils are a fairly rugged part only damaged by being rubbed by the flywheel or perhaps chafed leads. True, the driver coils have been updated/improved over the years, but I’m thinking the driver coil is NOT causing your no spark condition unless the resistance is way off or it is physically damaged. As all have stated, both sets of points have to be in good shape, one bad set could kill spark to both cylinders. Be sure to disconnect the stop switch to rule that out. The harness in the mag plate has been known to get pinched, cracked, or split causing problems. Be SURE the mag plate is properly grounded, it has an actually ground strap lead from the mag plate to the block. Check the resistance between the mag plate and a good block ground using the low ohms scale, any readings over a few tenths of an ohm is NG.
CORRECTION: Driver coil resistance is only a few ohms, not several hundred! Different models and years of production resistances vary a bit. I know there was a service bulletin years ago advising a different resistance spec for newer/updated driver coils, but don’t have access to that bulletin.