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・Save up to 30%

Get a quote

What others are asking

Q: I was at 50 miles from empty. I just filled up to full and it only gave me about 215 miles from empty. Typically it holds up 350 p

The fuel range calculator in your car's computer works based upon your most recent driving conditions. The throttle position sensor constantly calculates your fuel range based upon your driving behaviors. You will notice, if you are driving more aggressively or...

Q: Key not turning the ignition cylinder.

Hi. A test that can be administered would be if you have a spare key, try to turn on the car with that key. If it turns on, then that would indicate you have a bad key and you should...

Q: not starting

The first thing to check is to see if you have fuel pressure at the fuel injector fuel rail. Sometimes the fuel filter housing will block fuel from coming from the fuel tank and blocks the fuel from getting through...

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...
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...