Skip the auto shop - Our mechanics make house calls

Q: Check Gauge light came on. Amps on gauge dropped to zero on gauge

asked by on

The check Gauges light came on. Gauge on battery dropped to zero. Changed Altenator which was bad. Still does same thing. Battery is good and new Altenator is good. What else could cause this problem

My car has 182000 miles.
My car has an automatic transmission.

Hi There, It sounds like you may have an issue with your voltage regulator. This is a unit that regulates the amperage that the alternator sends to the battery effectively making sure that the battery maintains the proper charging. When this is not working correctly, this may cause the battery to be overcharged or undercharged (in your case). You may also possibly have a faulty amperage gauge producing an incorrect reading. If the vehicle runs for an extended period of time (more than an hour or so) with this reading at zero, it is likely that you may have a faulty gauge. Normally, if the battery is very weak and is not being charged by the alternator, the vehicle may only run for about an hour at most before shutting down. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your truck.

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: Have no reverse and a transmission fluid leak

I would recommend having your transmission inspected by a certified transmission expert to determine the exact cause of this issue. It is very possible that some internal damage has occured to the transmission from the loss of fluid. It is...

Q: 1994 dodge ram, starts and idles fine,can rev engine, no problem, when I put it in drive and accelerate it sputters and backfires

Hi there: The only things that I could think of without being there to complete a diagnostic inspection is that perhaps the idle control valve dirty, faulty or is damaged and needs to be replaced. It could also be a...

Q: Check engine light coming on

Cold weather causes plastic and rubber components to contract. The intake manifold on my truck would expand and contract every winter, setting P0171 and P0174 lean codes. Then finally, this past winter, the manifold cracked. My guess is that you...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.