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post #1 of (permalink) Old 07-06-2002, 01:41 AM
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Still no spark from Coil!!!

Hi all,

As posted earlier, I have an 85 CJ-7 that I put a 401 into. I had it running for a short time, and it suddenly died.
I'vge narrowed the problem down to electrical, but am stumpped. Here's why; I have no spark coming from my coil. I've checked the wires, and even put some jumpers from the batt to the appropriate posts on the coil.
I changed the coil (because I thought it might be bad) and it was still "no go". I did a "Nutter Bypass", and replaced my ignition module. Still "nogo".

The engine turns over fine, but doesn't want to start. The coil isn't producing a spark...

Where do I go from here?

Thanks in advance,
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post #2 of (permalink) Old 07-06-2002, 07:38 AM
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Re: Still no spark from Coil!!!

Has it run since you did the Nutter bypass?
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post #3 of (permalink) Old 07-06-2002, 09:37 AM
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Re: Still no spark from Coil!!!

1. Do you have a volt meter? If not buy one.
2. Don't put jumpers ANYWHERE unless you know why you're doing this and what the results will, or should be. You can take out circuits doing that! My simple guess is that you may have fried the igniton module by doing this activity.
3. Why did you thing the coil was bad?
4. What did you replace the coil with?
5. Why did you do a Nutter bypass?
6. What wiring directions did you follow?
7. Why did you think if the OEM ignition would not work that the Nutter bypass would cause it to work?
8. Have the new igniton module and coil tested.

Ok, now let's get back to basics.

1. Restore the ignition stystem to stock. Troubleshoot from there. If this system does not work, the Nutter won't work either.
2. Do you have 12 volts at the positive post of the coil in the START position of the ignition switch?
3. Do you have about 8.4 volts at the positive post of the coil in the RUN position of the ignition switch?
4. Does the negative side of the coil go to the igniton module? This provides negative return for the coil. The coil is NOT grounded.
5. If you put a test lamp on the negative side of the coil and crank the engine does the test lamp flash? If it ain't flashing you've got:
a. A bad pick-up in the distributor
b. A bad ignition module or,
c. The distributor is not turning or,
d. A combination of the above.
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