Q: Q: Battery light on

asked by on

The other day one of my heater hoses broke from the connecter, spilling all the antifreeze all over , I replaced that , but now I'm having problems with the battery charging light coming on, I already replaced the battery and alternator, and old alternator tests pass, but when I tested it with the outside machine , it said voltage regulator failed, any suggestions? I asked all the guys at work , they don't even know smh.. help me

My car has 650000 miles.
My car has an automatic transmission.

Hello. If you continue to have a low voltage issue with the new alternator then there may be a circuit issue. Most of the time, if the alternator is good, it is the battery cables or there is an issue with the amp sensor on the battery cable. Most of the time it is a failure in the battery cables themselves. I usually do a voltage drop test on the battery cables first to see if they are bad. I replace them if they fail the test. If the cables are fine then I test the amp sensor which is the second most common cause of this. One of those two should be the problem. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the battery light firsthand and help you make the necessary repairs.

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

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!
  1. Home
  2. Questions
  3. Q: Battery light on

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: Brand new battery car won't start - 2000 Chrysler Concorde

Hi and thank you for contacting YourMechanic. It sounds like there is a ground to chassis problem that is draining your battery. Check your negative battery cable for corrosion and make sure that the connection points are secure and clean....

Q: Battery replaced, but car still dies

This is definitely an intermittent issue which makes it a bit harder to diagnose. The most likely cause would be a wiring issue, ignition switch, ECU failure, or a battery cable issue. I would recommend having a qualified technician, such...

Q: I took my throttle body off to clean it now my car is idling/revving real hi even in park what should i do to fix it

Hi There, As you may know, after cleaning the throttle body your car needs to go through a "re-learning" process to bring the idle back down. Try doing the following which should bring the idle back down to a normal...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...