Testing a coil
Posting Guru
Joined: May 2002
Posts: 1,300
Likes: 0
From: Southwestern Michigan
Testing a coil
I will assume you have a 73-79 Model truck. Everytime I have had a no spark problem it turned out to be either the spark module, (silver/gray metal box on drivers side fenderwell) or the wire connections at the coil.
Posting Guru
Joined: Aug 2000
Posts: 1,984
Likes: 2
Testing a coil
Mike, the primary resistance should be about .8 to 1.6 ohms. Measure this between the two small terminals (+ and -).
The secondary resistance should be about 7.7K to 10.5K ohms. Measure this between the coil negative terminal and the large center terminal (where the cap wire connects).
I agree with Tellico, you probably have a faulty ignition module.
The secondary resistance should be about 7.7K to 10.5K ohms. Measure this between the coil negative terminal and the large center terminal (where the cap wire connects).
I agree with Tellico, you probably have a faulty ignition module.
