Q: After new battery and alternator, truck won't start

asked by on

I have a new alternator, new battery, and a good starter, but the battery is continuously dying. At a local auto shop, I was told that everything was okay, but the very next day, my truck won’t start. It is around 5 times that this has happened. They did say that there might be a battery drain and to go back if it happened again. Sure it happened again! What do you think is happening and can you tell me please, what will correct this?

Hello! It sounds as if your have a parasitic drain present. I would have a technician perform a parasitic draw test on the vehicle. It should be fairly easy to isolate the circuit that is draining the battery by performing this test. An easy way to perform such test is by connecting a digital multimeter to the battery then pulling fuses one by one to way for drastic reading changes.

If you need some assistance with this check, contact a certified mechanic who can diagnose your battery problems firsthand and make the necessary repairs a your own convenience.

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. After new battery and alternator, truck won't start

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: replaced battery and alternator, car at a red light bucked, all the dash lights came on and it died.

Check for stored OBD-II trouble codes. Your issue is not likely to be related to the alternator/charging circuit. If engine speed went up uncommanded, that points more toward a malfunctioning engine sensor or engine controls. As far as the PCM...

Q: Car needs new battery or alternator.

A technician, such as one from YourMechanic can come out a test the battery and determine if the alternator is running correctly. They can perform a load test on the battery and test all your fuses and pull codes on...

Q: ABS, fuel, and temperature gauge lights on when start car

Hello. I think that you should have your alternator retested by a different mechanic. The alternator cannot possibly be tested correctly with a dead battery. If the vehicle is not running, the alternator will not do anything. If the battery...

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 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.
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.