Q: Just replaced batteries,alternator and starter on 1987 C 3500. I have no clue what to do now. What should I look for next? Cables?

asked by on

Just replaced batteries,alternator and starter on 1987 G 3500. Batteries keep dying even when truck is on. What should I look for next?
My car has an automatic transmission.

Hi Juan. Thanks for the question. A continual battery drain is usually caused by a parasitic drain - or there is some accessory that is continually open and operating. In most cases, this is caused by a damaged electrical relay. So, i’d start by checking all relays and fuses and replacing any that appear damaged. Also, you should check the electrical connections to the alternator and battery charging wires (especially the ground wire) to ensure you are not have issues with those cables.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Just replaced batteries,alternator and starter on 1987 C 3500. I have no clue what to do now. What should I look for next? Cables?

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 does not start sometimes, sometimes it does.

Try disconnecting the battery. Disconnect the electrical connections to the body control and engine control modules. Apply dielectric lube to the pins and seals using small amounts only. Reconnect the modules and then reconnect the battery to see if this...

Q: Q: Transmission not shifting out of 1st gear

Hello. The symptoms you are experiencing can be caused by a wide variety of different issues. Anything ranging from a bad shift solenoid, to a faulty transmission, to an electrical problem, can produce symptoms similar to those you are experiencing....

Q: Car begins to decelerate and lose power as im driving.

Hi there. The most common cause of this on your car is either a restriction in the exhaust caused by a failing catalytic converter, or a fuel system issue. Low fuel pressure will cause this and that would typically be...

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 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...
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.