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: How do you change a tire

Follow your owners manual for spare tire install and to locate your jack, lug wrench and spare tire in the trunk area. As a general rule you should apply parking brake or clock wheels from vehicle rolling. Loosen lug nuts,...

Q: Antitheft light flashing on dashboard

It sounds like the ignition switch has gone amiss. There is an antenna built into it to detect the proper key. If that malfunctions, your Anti-Theft Light will come on. The key not turning is a different problem. It is...

Q: Hard starting and clicking noise

The clicking noise is an indication of either a bad or discharged battery or a bad connection in the starting circuit. There are two circuits in every starting system: the primary circuit that is energized by the key, and the...

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.