1987 Johnson Evinrude "CD" Colt/Junior thru 55 Commercial service repair manual, P/N 507546, Page 183Get this manual
Quality of the image is intentionally reduced!
6 Test resistance of high tension leads on low ohms scaleResistance should be near zero
A steady spark at or before maximum specified amperage indicates good coil
Deluxe thru 55 Mod