Skip the auto shop - Our mechanics make house calls

Q: Car won't start, battery drain - 1979 Mercedes-Benz 450SL

asked by on

If my car sits for more than one hour, I have to get it jump-started as it wouldn't start up. I figured that the battery is getting drained so I need to check the voltage regulator, but I just can't find it. Is it possible that it's in the alternator?

A: Hello. The Chilton manual will be able to g...

Hello. The Chilton manual will be able to give you accurate information as to the location of the voltage regulator. This manual can tell you whether your voltage regulator is an internal or external part. It is not recommended that this repair job be completed on your own. Have a certified technician, like one from YourMechanic, pinpoint the cause of the starting issue and address this problem correctly.

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: Changed out the alternator and battery. Car will not start without a jump.

This may be a sign of a failing voltage regulator. This is a unit that regulates the charging of the battery by the alternator. Often times this will result in the alternator allowing too much power to be delivered to...

Q: Something locked up the wheels

Hello. I would recommend having your suspension and brakes checked. This will include removing the front wheels. With the wheel removed, it will be much easier to determine what the actual cause of the lockup is. The lockup may have...

Q: New battery in truck being drained.

The battery's main purpose is to start the engine and provide a reference point for the alternator to use. If the battery is never charged by the alternator, (either because it has failed or the belt is no longer spinning...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
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...