Aftermarket coils, don’t match OEM specs like you might expect.

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
14,323
A have a couple of spares for my old OMC, and including the old OEM matches the specs in my shop manual….
OEM spec for secondary: 7500 ohms
Actual reading on OEM coil: 8500
Prestolite aftermarket (this engine has a Prestolite points distributor): 15,000
CDI: 8500 but this one must be defective, quickly breaks down under use
Do these differences actually matter? With old boats usually there’s no more OEM….
 
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