Skip the auto shop - Our mechanics make house calls

Q: Has new alternator, new battery when started , motor dies when battery is disconnected...my mechanics are stumped on this

asked by on

its a dodge 1986 b250 custom 19 ft long camper van, or title says body type MH wt 4500 its not charging the battery once battery s dead so is engine, replaced battery and alternator, the charging system includes a two battery system one for house and one for car it all looks factory installed, has a isilator an all.....you have any further ideas what might cause the power to not reach the batteries.. thank you thomas

My car has 72000 miles.
My car has an automatic transmission.

A: If replacing those particular components ...

Hello.

If replacing those particular components did not correct the issue then the next thing I would look at is the vehicle’s voltage regulator. It appears that this engine’s electrical system is equipped with an external voltage regulator that functions, or malfunctions, independently of the alternator. The voltage regulator regulates power from the vehicle’s alternator, and can cause issues with the electrical system when it malfunctions. I would test it to see if it is functioning properly. It is a silver box that should be mounted somewhere in the engine bay, usually on a wheel well. A technician from YourMechanic can come to your home or office to replace your car’s voltage regulator if necessary.

Regards, Eduardo

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: Car battery light constantly goes on and off.

Hello. The fact that the car struggles when you take the jumper cables off suggests that the battery is not able to maintain a charge on its own. I would recommend checking the alternator and the voltage regulator as these...

Q: Starter not engaging flywheel

Hi. If you have replaced all of those components and now the starter is not engaging I would believe it was the ignition switch. I recommend having a technician come out and check voltage at the solenoid and starter and...

Q: van runs lean or low on first start of the day.

This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.