Question about 1994 Jeep Grand Cherokee

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1994 grand cherokee ltd. charging problem

It has the v-8 engine........new alternator last friday, new battery today, monday.........still does not charge correctly...........

is it true that the regulator is in the computer and fed to the small plastic box connected to two screws on the back of the alternator??.......since the orginial alternator was rebuilt one year ago, the battery replaces about 4 weeks later........now about one year later, in the summer, it does not charge again..........

here is the kicker.......when below 75 degrees outside, the alternator seems to work fine.........but when it gets over 80, it refuses to charge..........i must use the a/c all the time as my wife has breathing problems and must have a/c.

please help as this is getting expensive.....the vehicle is very dependable except for this quirk..........

thanks

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Yes that little thing on the alt is the regulator. It tells the alt when to charge and when not to and yes its pcm controlled. You can bypass the pcm but I would not reccomend it. I would say alt is probably bad...Cause that pcm wire dosnt usually cause any issues. Youu can have the alt tested at autozone. They can test it in the car or out although out of the car is a much more thurough test. I would again say al is bad....rebuilt stuff is usually rebuilt with good parts from old units meaning most all the parts are used...

Posted on Aug 06, 2008

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