Question about 1997 Jeep Wrangler

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I have had the battery & the alternator "shop-tested" (twice) now & they are both "good". My Jeep will run fine for a few miles/ minutes untill "out of the blue" my voltage gauge drops down to nothing & my dash light "check gauges" illuminates. I had this prob. last Saturday & the parts house, nor myself could figure it out. So, I cleaned up the corrosion from my batt. post's & on my batt. terminals, hooked everything back up & I had no problem untill yesterday (Thursday). I have pulled off the battery clamps from the battery "while engines running" & seconds later -it dies !! My multimeter will read 12.16 volts on the battery terminals "while engines running", I know this is too low. Fusiable-link was "continuity tested" & was "fine". My cuzins pretty knowledgeable in automotive problems- He tested things w/ me & told me to look into the the "Ignition Switch' Situation !! The electrical-problem is somewhere between the Battery & the Alternator. & all these various parts I am pretty un-familiar w/. -my vehicle is a 1997 Jeep Wrangler SE, 4-cyl. 2.5 ltr. Fuel-Injected engine, w/ a manual trannsmission. Anyfeedback is greatly appreciated !! Thank You Mark A. Porter

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Test the alternator charging capability by connecting a volt meter to the battery terminals and starting the engine. The voltage should be at least 13 VDC.
If it's less it will not charge the battery enough.
Hope this helps.

Posted on Mar 29, 2015

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  • Jeep Master
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Your alternator is regulated by the PCM. It could be the PCM or the ignition switch. Might want to try swapping out the shutdown relay just for grins before getting into the ignition switch. Good luck.

I have had the battery - 19f5b76.gif

Posted on Oct 02, 2010

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