Skip the auto shop - Our mechanics make house calls

Q: Battery won't stay charged

asked by on

Have replaced battery, alternator and starter and it won't stay charged. Note... the radio and clock do not work.

This is a common problem when the voltage regulator is failing which is potentially due to a faulty ground or connection. I would start by checking the battery connections and cables to be sure they are not dirty or corroded. Also, check the ground cable (black going from battery to chassis of truck) to be sure it is properly connected. Lastly, I would recommend having the voltage regulator tested. This is a unit that regulates the charging activity from the alternator to the battery. When this is not working properly, this can cause the battery to over or under charge resulting in it dying. Since there are a few things to inspect, I would recommend having a certified professional from YourMechanic come to your home to inspect the battery along with the other components mentioned.

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: My back left light is very dim and the turn signal doesn't work

The wire connection at the turn signal multifunction switch should be checked for heat related damage and replaced with a new multifunction turn signal switch. The switch goes bad but also the connector can be damaged also at the same...

Q: Can I wire up many things to my truck battery?

Hello - while the LED light bar has a small load factor, the winch is a heavy current load. If you were running the AC, wipers, all vehicle lights, and the winch at the same time, you are probably drawing...

Q: No heat after replacing dead alternator

Your heater works on a few critical components. The blower motor, the heater core and the relay which is what triggers the blower motor to have the power to push the air through the vents. The blower motor is actually...

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...
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...
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.