Skip the auto shop - Our mechanics make house calls

Q: Gen light

asked by on

My gen is on wen i drive and i replace the battery and alternator

A: You will need to check to make sure the two...

You will need to check to make sure the two red wires to the alternator have power. Afterwards, follow the wires down to make sure they make contact to the starter terminal that goes to the battery. Follow the brown wire after checking that to make sure it registers at least 13.5 volts when the engine is running at 1500 rpm. If you do not have the proper voltage then the alternator is defective and will need to be replaced or have the wiring repaired as needed.

I’d recommend the getting some assistance from a certified technician who can perform these checks in order to diagnose the warning light that’s appearing. Once that is done, the right repair can be made.

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: Brake pads warning light after having them replaced

The brakes have a brake pad sensor that alerts the driver when the pads get worn down. If you have had the pads and rotors replaced within about 24,000 miles or less, then you may have issues with the brake...

Q: Car oftentimes doesn't start, when it finally starts it doesn't stay running.

Hello there, many common faults will cause your 1989 Oldsmobile Cutlass Supreme to have a hard time starting and die after it starts. You have done great in replacing the crankshaft position sensor, fuel pump, fuel filter, and ignition module...

Q: My four way and left turning signals don't flash

Hello - I suspect there is a bad ground or wiring damage on the left side wiring for the turn signals. The turn signals and emergency warning flashers use the same flasher unit, which explains why the right side turn...

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...
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...
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...