Re: Charging System
When you get time please fill out your BIO, at least on your jeep. It makes it easier to help you....at a minimum, we need the model and year.
You on the right track. As 97TJ said, if you have an external regulator, that could be it. But you would have to have a really old jeep. There is not a lot to go wrong here. You will most likely need a voltmeter to troubleshoot the problem.
1. With the engine off, measure the voltage at the battery. You should have at least 12 vdc. If it's less, take the battery to your local parts house. They will test if for free.
2. Start the engine and again measure the voltage. At idle you should have at least 13.5 to 14 volts at the battery. Your dash meter should also read the same as the DVM. If you have to rev it up to get up to 14 and the battery is good, then you could have gotten a bad rebuilt.
3. While you have the voltmeter, measure the voltage from the battery neg terminal to the block and the frame. You should not have more than about .2 vdc difference. If you do, check for a bad ground.
4. Don't be afraid to pull the altinator off and take it back to have it checked.
It is possible to have a loose fan belt that is sliping real bad, but I think you would notice that. Just a side thought? Did the new rebuilt come with the pully or did you have to swap them out? Drag racers will sometime put a larger pully on the altinator to reduce the load on the engine. I would be real surprised if that happened to you.
Was it working fine before? Did anything happen just before this problem?
Get back with us and we will help you in any way we can.
84CJ7, 3"lift, 32"BFG, 4.10's, ARB Rear, Detroit Front, Solid Axle's, Durabak, York Air
They say we learn by our mistakes......I guess thats why we are all so smart.