Question about 1994 Jeep Grand Cherokee

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I have a 1994 grand cheerokee limited that has the check engine light come on every so often and the rpm start jumping up to 1 and down to a stall sometimes it don't stall. The battery gauge meter starts showing the battery being drained from 14 to about 11-10 whe ni turn on the heat, lights, wippers blades, and sterio. this has been happening since i got a new battery last Winter. can you please help me. thanks.

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Likely you have a bad connection at the alternator or the alternator has developed an internal short or disconnect.
Have your charging system tested. Some testing is done without regard for the fact that some Jeeps have the regulator incorporated into the computer itself. If the alternator is "full fielded" and checks out as good, that tells you nothing about the regulator.(most times a problem like yours is in the alt though).
A code test (free at most larger parts stores) may show a low charging rate. If so, go right to alt testing.
good luck

Posted on Dec 10, 2009

Testimonial: "yeah i got the alt. tested and i do need to replace it. thanks for the advice"

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