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rpmdiag
rpmdiag, Tech and Instructor
Category: Jeep
Satisfied Customers: 8144
Experience:  Since 1975
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Once veichle is warmed up the voltage drops when the car is

Customer Question

Once veichle is warmed up the voltage drops when the car is at idle. The fan and other accessories make it worse
JA: How many miles are on the car? What size is the engine?
Customer: 5.2 170,000
JA: What is the model/year of your Jeep?
Customer: Grand Cherokee 1994
JA: Are you fixing your Grand Cherokee yourself? What have you tried so far?
Customer: I am already changed the battery and alternator
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 9 months ago.
Category: Jeep
Expert:  rpmdiag replied 9 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 9 months ago.

Before replacing anything, have the starting and charging system tested. Most parts store do this for free.

It sounds like a bad alternator, but let's be sure.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron

Expert:  rpmdiag replied 9 months ago.

Do you have any more questions?

Thanks, Ron

Expert:  rpmdiag replied 9 months ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron