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.

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!
  • Home
  • Questions
  • Has new alternator, new battery when started , motor dies when battery is disconnected...my mechanics are stumped on this

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 is dead

Hello, and thank you for writing in. The battery is simply used when starting the vehicle, and to complete the charging circuit. The alternator powers the vehicle while it is operating. If there are no electrical components working, then the...

Q: Transmission slipping even when I had the transmission replaced.

Hi there. If the transmission was slipping and you had the transmission replaced and the transmission is still slipping, then there could be an issue with the shifter cable or downshift cable. Check the cables and see if they are...

Q: Engine dies and backfires

Hi There, It sounds like you may have a fuel supply problem that may be getting an inconsistent amount of fuel to the motor, which may be what is causing the backfiring and the bogging down. A faulty or leaking...

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...
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.