Ok so i think i Made some progress (i hope). I put the new coil in today but it did nothing. Going back through JeepHammers notes I connected to Batt + and to the - lead on the coil connector...and no light. So the ground must be bad somewhere. My question is, can I just ground the coil to the battery or motor mount or do I need to trace the wire back and find the problem?
Id like to test the harness and I found these directions but dont quite follow them. Can anyone simplify these directions even more?
That is one test probe to the unplugged wire (unplugged on BOTH ends of it's run) and one test probe to 'Ground' to see if the wire is rubbed through somewhere and shorting to 'Ground' where it shouldn't be...
If the harness test out, then you are left with ONLY the module
Update again: I decided to ground the coil to the battery, and the terminal in the connector provided a ground when tested with a light as expected, but still no spark. I went back through and tested everything again and these are my results.
Coil connector positive wire test
Coil Connector negative wire test
- My light didnt dim, meaning the resistor wire is broken or missing
*After adding the jumper from connector to negative battery terminal the light came on. But the OE green wire did not provide a ground
Crank the engine while testing the negative coil connector wire and look for blinking
*my test light did not blink, meaning the issue is on the engine bay side of the system. He says if it did not blink it is a bad module, bad trigger (stator) in distributor, no power to module, or bad wiring in between. It is a brand new module and I have power. Stator test also looked good, so bad wiring?
Test the resistance in stator in distributor by probing the two parallel blades in connector. Should show between 400-800
*The resistance was 598 so im assuming I can rule this out as a problem
[B]If the stator tests out go to module, pull two wire plug apart. look for zero volts at red wire with key switch off, and 12V with key in run[B]
*This checked out perfect, however I did not check for 12 volts at blue wire while cranking.
I checked for a good ground on the harness side of ICM plug and it grounds. This confuses me because the wiring diagrams show this as the same wire as the green wire at the coil which doesnt ground. So Im assuming my problem is the negative wire somewhere between the coil and ICM. Can I do anything except trace the wire all the way through the harness.