Posted 2018-11-06 3:49 PM (#573064 - in reply to #573063) Subject: Re: How to check a coil
Board Moderator & Exner Expert 10K+
Location: Southern Sweden - Sturkö island
Yes, check the prinary side between + and - on the coil; with the wires disconnected with an ohm meter. You should have roundabout 1.5 ohms. Check the secondary side between + and distributor connection, the value should be roundaboth 9 ohms in an oem coil.
Posted 2018-11-06 5:18 PM (#573067 - in reply to #573063) Subject: RE: How to check a coil
Location: Hilltown, PA
Also do a dynamic test if it works but you suspect poor output. Simply pull the secondary or ignition wire loose from the center of the coil and hold it a short distance away form the coil terminal. A good coil will produce a spark that is bright blue to white in color, and will consistently jump a gap of 3/8 to 1/2 inch. A poor or weak coil will generally only be able to muster a yellow spark that barely manages a 1/4 inch gap.
Of course proper dwell affects this, as does the capacitor and condition of the points. Point style ignitions may only see a yellowish spark, but it should be bright and able to jump a large gap.
Electronic conversions should be more in the blue to white range with larger gaps.