Skip the auto shop - Our mechanics make house calls

Q: I have a 96 Isuzu trooper that while driving with the AC on, the voltage meter will jump all the way up, after about five minutes.

asked by on

I have a 96 Isuzu trooper that while driving with the AC on. After about five minutes, the voltage meter will jump all the way up, the engine is bogged down when trying to take off and when i put it in park the engine races up. When this started, I had the battery checked, it was bad so i replaced it. Today i replaced the AC belt. Still doing the same thing. If i drive without the ac then it runs fine.. Ive read it could be coils, O2 sensor, or alternator..please help

My car has 169000 miles.
My car has an automatic transmission.

A: Hi there. If the voltage is going all the w...

Hi there. If the voltage is going all the way up, then it may be overcharging and can damage the battery and other components. Have the alternator tested to see if it is overcharging and replace it if it is. If you need help with having the diagnosed, have a professional from YourMechanic inspect the electrical system in order to have the correct repairs done.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do you calibrate the electronic compass?

Your car’s electronic compass (if equipped) should be calibrated when you buy it, but it may lose its calibration due to interference from power lines, strong magnetic fields or even from replacing the battery. When this happens, you need to...

Q: car starts fine sometimes after its turn off wont start for while

Hi there: Most of the time when your car won't start it's due to a fault with the ignition or fuel system. If the issue is inconsistent as you've described, it's possible that you have a loose electrical wire that...

Q: hello Joshua, Door front Panels both sides

The largest on-line database of used auto parts is Car-part.com. If you are unsuccessful sourcing the desired parts through that site, please re-contact us and we will look elsewhere. Of course, Ebay is an additional source. If you have additional...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.