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  #13  
Old 04-14-2017, 06:30 PM
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And when Jeep is running the windows won't go up or down but will with the engine off and key on...

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  #14  
Old 04-14-2017, 06:37 PM
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Now when I unplug alternator it's fine but charge rate is low.
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Old 04-14-2017, 11:18 PM
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Re: 1999 Jeep Grand Cherokee limited charging

Maybe that all the problems are a result of the high voltage, so I would focus on that first. Does it still charge with the alternator unplugged? So or the alternator has a problem, or the field regulation has a problem. Since you changed the PCM, it could be wise to measure the field wires and see if there is no short to a voltage wire somewhere. Maybe some unregulated voltage can reach the field wires and cause that very high voltage from the alternator.
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Old 04-15-2017, 05:29 AM
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The alternator charge at low rate checked wires the go to pcm from alternator no short.
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Old 04-15-2017, 06:49 AM
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Re: 1999 Jeep Grand Cherokee limited charging

You disconnected the small connector from the back of the alternator? If so, the field wire will be interrupted and the alternator should not have any output, besides maybe a low voltage due some residual magnetism inside the alternator.
If the alternator still charges, then its voltage should be higher then the battery voltage. If that occurs with the small connector disconnected, then there should be an internal problem with the alternator.
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