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.

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 1,000 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
  1. Home
  2. Questions
  3. 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.

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: Can a Car Battery Overheat in Hot Weather?

People often only think a battery will get damaged in the winter. However, the summer heat can be even more damaging than the winter’s cold temperatures when it comes to car batteries. The summer heat is when most of the...

Q: My car won't shift into gear

Hello, there is a park shift interlock system on your car that prevents the vehicle from being taken out of park when the ignition circuit is not powered up. I think you have an ignition switch voltage concern. If there...

Q: It keeps on beeping and shows a radiator sign on the screen

Hello, thank you for writing in. When you are in this type of position the best thing to do is get a third opinion. If you do not have that option for one reason or another, you will want to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.