Question about 1994 Jeep Grand Cherokee
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.
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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Posted on Jan 02, 2017
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Engine stall or RPM fluctuates
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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