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post #1 of 7 Old 06-02-2012, 06:43 PM Thread Starter
Chris27
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Low volts

Voltage issue
My 95 grand Cherokee is having an issue with voltage. When I start it, volts are a little lower than normal. Still within operating range. The volts go back to normal when put in gear. When my jgc sits a bit, it cranks a bit more to start than normal. Can anyone help me with these issues. Thanks.
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post #2 of 7 Old 06-03-2012, 02:25 PM
bluejunior
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At that age, your alternator could be going. Most of the jeeps then had a wimpy little 96 amp unit, and if you have a lot of extra lights, gadgets or a sound system it can overstretch them. My XJ did something similar, it was having more trouble starting because the battery was never quite fully charged because of the low output, and the voltage would pick back up in gear because of the little bump in RPM that gave. I got a 126 amp out of a Dodge V8 from my local alternator shop and never had another problem. Cost me like 70 bucks and bolted on with only a LITTLE modification. (the bracket overlapped so I had to file a few millimeters off the new alternators little mounting arm)
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post #3 of 7 Old 06-03-2012, 04:18 PM Thread Starter
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Thanks. I was driving my self crazy trying to figure it out. I have replaced alternator 2 times, with old ones from junk yard. Maybe time to buy rebuilt.
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post #4 of 7 Old 06-03-2012, 08:52 PM
bluejunior
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Junkyard parts are risky. An alternator shop should be able to test it for you, so put in a couple calls before you spend the money again.
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post #5 of 7 Old 06-05-2012, 04:39 AM
LorenII
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Jeep has NEVER been known for accurate gauges. My XJ shows (on the dash) that I am only putting out 11-12 volts, when the scan tool shows 14.4+ volts. Unless you are having starting issues or the battery is draining, I would just rock right on along and not worry about it.

You can take your alternator in to most autoparts stores and they will check it for free for you.

I now understand... Just Empty Every Pocket
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post #6 of 7 Old 06-05-2012, 04:45 AM
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Also, my XJ takes a few seconds to start too. It is the fuel pump building up pressure. Turn the key on, wait a second or so, then crank.... Should fire right up.

I now understand... Just Empty Every Pocket
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post #7 of 7 Old 06-05-2012, 05:26 PM Thread Starter
Chris27
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Thanks everyone for your input. The alternator is fine had it checked. The only thing left is the issue of it not firing up right away. The fuel pump was replaced but it was used also. I tried turning the key and waiting but even when I did that it still took a few seconds before fired. Jeep runs great but I'm just a little concerned. When it's warm and shut off it fires up just fine. when it's been sitting for a while, it takes a few seconds to crank over.
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