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: Battery dead in 2 days

Hello. Thanks for writing in about your 2007 Lexus LS460. If the battery is draining that fast you either have a faulty battery or a possible parasitic draw draining the battery down. The battery should be charged and load tested...

Q: Can I remove with EPC solenoid and wiring harness without removing the valve body?

The solenoid may be removed without removing the valve body, however, the valve body will need to be removed in order to get the harness out safely without damaging it. There are two bolts that hold the solenoid in as...

Q: No heat from vents floor defrost

The first thing to check is to see if both heater hoses are getting hot and staying hot. Then from inside temperature controls check to see if the inside air temperature can be adjusted up and down. If temperature stays...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.