Skip the auto shop - Our mechanics make house calls

Q: Voltage regulator smoking after replacement.

asked by on

My vehicle battery wasn't charging. I replaced the alternator and the voltage regulator. When I restarted the vehicle, the ground wire that is bolted to the voltage regulator began to smoke. I turned the car off and disconnected the battery. What do I need to do now?

A: Hello, You should check the integrity of t...

Hello, You should check the integrity of the ground wire. If the rubber coating is melted it must be replaced. You should be sure that the alternator they gave you doesn’t have a voltage regulator built in or attached to it. If the alternator is the correct one, disconnect the alternator completely, plug in the regulator, connect the battery and turn the key on and see if you get the same result. If you get the same result the regulator is faulty. If you don’t get the same result, disconnect the battery, connect the alternator, connect the battery and see what the result is. If it starts to smoke again and the alternator is faulty, return the parts and get replacements. You might need the aid of a mechanic, such as one from YourMechanic, to check for damage wiring, perform wiring repairs and diagnosis as needed.

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 Long Does a Car Battery Last?

Whether you drive a vehicle for work or roaming around town running errands, one constant reality is that we all depend on our car's battery to start the vehicle on the roads we travel. However, one of the frequently asked...

Q: My truck will not open anymore at all and then I put the key it won't twist ether?

It could be that you have a lock actuator that is jammed. The actuators can operate the locks, but are also moved by the key in the lock. when they become jammed everything just stops working. There isn't much that...

Q: I have replaced a failed alternator once a month for the last four months, any suggestions?

Your vehicle has a recall for the alternator cable shorting on the power steering line after the insulation gets rubbed through. The recall is for inspecting and replacing the alternator and alternator wiring. The recommendation I have is to contact...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.