TR upgrade ? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-08-2002, 02:51 PM
JimD
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TR upgrade ?

I have been running the upgrade on my 289 powered 5 for almost a year with no trouble. I built a fan shroud for the jeep and when I was finished I pulled the coil wire off the coil so the jeep would not start. Just to make sure nothing was going to rub. When I cranked it over the coil spark went to the mounting bracket (ground). I replaced the wire and the jeep would not start , After some troubleshooting I found the module was bad. I replaced it and the jeep runs great. Can anyone tell me why this happened or is it something that I have wired wrong?
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post #2 of (permalink) Old 04-09-2002, 01:51 PM
JimD
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Re: TR upgrade ?

Does anybody know???? Please.
post #3 of (permalink) Old 04-09-2002, 02:27 PM
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Re: TR upgrade ?

If I understand you correctly, you sent a huge voltage spike through the ground system when the coil wire arced to ground. That spike fried the module. You replaced it, and everythings OK now, right?
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post #4 of (permalink) Old 04-09-2002, 02:44 PM
JimD
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Re: TR upgrade ?

I pulled the coil wire out of the coil, the wire did not arc, the coil fired a spark to the mounting bracket. I have done this on other trucks I have owned and it did not hurt the modules. The spark did go to ground through the bracket, I did replace the module and the jeep runs fine. I just thought it was strange that it would fry the module.
post #5 of (permalink) Old 04-09-2002, 03:07 PM
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Re: TR upgrade ?

For some reason the Jeep modules must be more sensitive than others. I had a short under the dash that took out my module.
If it ran for 5 years with no problem before this, I would say the coil arc to ground caused the module failure.
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post #6 of (permalink) Old 04-09-2002, 03:13 PM
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Re: TR upgrade ?

Maybe it did arc to ground but maybe one arc went to the green (-) coil wire which goes straight to the module.
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post #7 of (permalink) Old 04-09-2002, 06:02 PM
JimD
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Re: TR upgrade ?

Thanks guys, I think Will might have hit on what happened, The plug for the coil is next to where the coil was going to ground. It may have jumped to the wire coming from the module.
post #8 of (permalink) Old 04-10-2002, 02:42 PM
 
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Re: TR upgrade ?

NEVER, EVER JUST PULL THE COIL WIRE OFF!!!

If you want to disable the ignition system, you should unplug the two wire connector to the module, (Red & White Wires)
OR
Disconnect the small wire connector to the coil.

More than likely what you did was discharge the entire secondary coil current through the module, and made it a paperweight...
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