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rpmdiag
rpmdiag, Tech and Instructor
Category: Jeep
Satisfied Customers: 6987
Experience:  Since 1975
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1997 wrangler tj start driving with a normal 13.3 volts but

Customer Question

1997 wrangler tj start driving with a normal 13.3 volts but after a while it drop to 9 volts .I took the altenator to autozone to be check and came out good. I checked every cable, made some voltage test and sometimes they were OK and other times were wrong.why is that?
Submitted: 5 months ago.
Category: Jeep
Expert:  rpmdiag replied 5 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

The voltage regulator/computer is what controls the charging amount. The alternator probably is fine. It doesn't sound like any wiring issues or it wouldn't charge at all.

Thanks, Ron