I was driving down the road and i heard a BEEP BEEP BEEP. I looked at my guages and the battey guage went below 9 and my CHECK GUAGES light came on. I smelled something, kinda like it was burning. I pulled to the side of the road, turned it off, and looked under the hood and didn't see anything wrong. So i started it back up and went on my way. About half a mile or so it did it again. Then the battery guage started going back and forth between below 9 and 14. A few minutes later when i was driving home it did it again; i had my lights and radio on this time because it was dark. When it did it my lights all dimmed down and then went back to normal.
I think it might be the alternator or battery. But i still would like a better answer.
I am not a mechanic by any means, but if you hare smelling burning electrical, you should check all your wire harnesses for anything that looks melted or crusty. might have a short somewhere. Check the wires for any stereo mods you may have done under the carpet also. Good luck.
The Voltage Regulator on a TJ is separate from the alternator, I believe the computer takes care of regulating the voltage.
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I posted this problem a while back. I found on my 2005 4banger the wiring harness which is run between the battery and exhaust manifold was melting due to the heat from the manifold. took some tyraps and pulled it away closer to the battery and secured it. To me this would be a common problem if all 4bangers are wired this way.
It ain't easy being cheesy:
Sometimes I make decisions like famous people.
George Armstrong Custer "lets go over that hill, I think those are friendly indians!"
Titanic's Captain Smith "What icebergs? Full speed ahead!"