Skip the auto shop - Our mechanics make house calls

Q: Battery keeps draining can it be a relay? 2007 GMC Sierra 1500

asked by on

A have a good battery about 2 years old the alternator is good can it b a relay that's draining my battery

My car has 90000 miles.
My car has an automatic transmission.

Hello - yes, it could be a stuck relay, or some other electrical component that is not shutting off when it should. To isolate the source of the battery drain, connect an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. A professional mechanic, like YourMechanic, can perform this procedure for you, and replace/repair the failing component.

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: The fuel pump will not kick on when I turn the key - I have power to the end of the connector at fuel pump but

Hi. Make sure the relay is good. I see that you installed a new fuel pump - make sure you have a good solid ground for the pump. If you are getting power to the fuel pump it is most...

Q: AC blows warm while idling, cools during driving

Hello. There are a couple of things that could be causing your problem. The purpose of the high pressure hose is to increase and decrease AC pressure during different driving conditions. If the a/c isn’t blowing cold air when the...

Q: I have a 1999 chevy silverado 1500 ls v8 5.3 liter what is my amperage on my altinator?

If you still have the original alternator installed, look at the numbers on the alternator. If you see a "K68" label (or part number 321-2104) you have a 105 amp alternator. If you see a "KG8" designation (or part number...

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.