Alternator/Diode or weak contact issue?? -
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Unread 05-07-2014, 05:03 PM   #1
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1998 XJ Cherokee 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 133
Alternator/Diode or weak contact issue??

Very similar threads to my problem, just no solid leads. I gave a jump to someone in need. The very next day while driving my voltage gauge spiked to 19 suddenly, check gages light came on. Continued to drive, few minutes it went off and voltage gauge returned to normal. Minutes later, spiked again. Immediately pulled into oriellys to have a voltage test done, revealing that my battery and alternator were operating normal.(I should note that my gauge had returned to normal before I had the test ran) I believe this is an alternator issue, but how or why? Since then, jeep drives all day everyday till yesterday. Wife drove and says spiked again, as shes parking it dies. Cranks right back up no problem but the clock was at 12:00. Any ideas guys?

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Unread 05-07-2014, 08:54 PM   #2
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1998 XJ Cherokee 
Join Date: Jul 2013
Location: Coleridge, NC
Posts: 133
I am a bit confused. Is my voltage regulator separate, or is it internal to my alternator??
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Unread 05-08-2014, 11:09 AM   #3
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Since your clock reset, it would seem that you have a wiring problem as clocks do not reset unless juice is disconnected. Clean your battery terminals first. If that does not solve the problem, start looking for bad grounds and/or wires that are corroded/loose/broken.
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Unread 05-14-2014, 08:27 PM   #4
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2010 JK Wrangler 
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Check your connections as stated. But your amp meter spikes don't sound too good.

Your voltage should be regulated externally through the brain. If you hooked up/unhooked the jumper cables improperly it might cause electrical issues.

IIRC it is; + cable on good battery first. Then + cable on dead battery. Then - cable on good battery and then........- cable on good unpainted surface of the dead battery's vehicle. The reverse order for taking them off when the dead vehicle fires up.
I usually do this then fire up the good vehicle....and wait for a full ten minutes. This give the dead battery to begin to accept a charge. They actually resist charging when they are real dead.

Doing it the wrong way could fry 'things' on the good vehicle that do not 'like' high resistance or shorting.
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