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Re: 1987 jeep grand wagoneer charging problem
Not a solution or a clarification, but there's no spot for just passing thoughts.... See what type of alternator you have in there (some are different than others. Since Jeep is now part of Chrysler I would not be surprised if the regulator is in the main computer. I've seen dodge vans with this system and it drove my friends shop crazy for two weeks till they found this out!
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Probably a bad battery. Bring it to a parts store for a free check of the charging system and battery. They can tell you what the problem is. Either the battery is bad, or the alternator is not charging.
It sounds to me like you need your charging system checked out. Before you do make sure your alternator belt is tight enough that you can't turn the alternator by hand, tighten if necessary before it is checked. What you describe would suggest that the alternator is maxxed out putting out enough power to run the engine and that's all and the battery is low enough that there is no reserve to run anything. Alternator output should be close to 13.5 volts at idle. The battery should be "load tested" to ensure that it is good. Any shop will have the proper tool for that. A load test will show whether or not the battery can deliver the power required and bounce back. Hope this helps.
I believe that your headlightsw are powered by a fusable link, likely connected near the alternator or battery, I't's possible that the wire may have dropped and did not get re-connected when you installed the alternator, or it was weak and failed while you were working.. I don't see why it would cause the aternator to not charge but either it also completes the battery circuit or there is a second wire.
The diode in the altenator is starting to go out.
I would check the belt to make sure correct tension and check the battery . The battery could be starting to go out , The battery might not be able to hold a charge anymore .