Overvoltage at RPM
#16
Seasoned Member
Finally commited suicide and fried itself. Almost caught fire. Lucky thing, the PCM fried. Wiring was ok. I regularly check my battery cables. I'm going to replace them with those suggested. Thanks.
Check your ground, check your ground. My new mantra whenever I drive.
Really can install an external voltage regulator? How. When did Jeep/Chrysler switch to external Voltage regulator.
#18
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Join Date: Sep 2014
Location: U.P. MI
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Year: 1989
Model: Cherokee
Engine: 4.0L
I think they frown on folks linking other forums, so just google "Jeep XJ external voltage regulator".
There's a few how to's complete with part numbers and alternatives for the external regulator project.
There's a few how to's complete with part numbers and alternatives for the external regulator project.
#20
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#21
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Year: 1996
Model: Cherokee
Engine: 4.0
Another tidbit, I get 13.6v running at idle with everything off except the radio. I get 12.6v with high beams on, a set of hella 500 on, AC blowing on max.
#22
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Year: 1996
Model: Cherokee
Engine: 4.0
I wired in an external voltage regulator and I get a nice 14v while driving. However, instead of a voltage spike over ~3000 rpm, now I get a blown fuse on the +12v source wire feeding the voltage regulator. So stock voltage regulator = voltage spike, external voltage regulator = blown fuse. Would it be reasonable to think it's the alternator at this point?
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