Skip the auto shop - Our mechanics make house calls

Q: how do I install a load resistor so that my alternator doesn't drain my battery

asked by on

My car for some reason won't keep charge. So I got a brand new alternator and battery but the battery still ends up getting drained of power and my car just shuts down. To solve this I was told I can install a load resistor. I don't know how. Part of it is installed but I don't know wht to do with the other end that has nothing connected.
My car has an automatic transmission.

A: I’m not sure what you were told but a load ...

I’m not sure what you were told but a load resistor will only drain your battery and charging system more. It sounds like you have a problem in the charging system not providing enough power for the electrical load you have put on it. From what you’ve described, you may have a massive power drain like a big amp or a radio and amp setup that is using up more power than the engine alternator can handle.

I’m not completely sure but I think what someone was telling you to get a capacitor bank to power the amp you have. This will help store extra power for the times the amp bass needs more power. This component will not allow the amp to take power directly from the battery. You should look at getting a higher capacity battery and alternator for your car if this is the case to go along with a capacitor bank.

I’d suggest getting this looked at by a qualified technician, such as one from YourMechanic, who will be able to diagnose your draining battery and help you fix it accordingly. Good luck.

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

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: Rain getting into car

I would need a little more information for a proper diagnosis, such as the location where the water is entering the vehicle, and whether or not your car has a sunroof. If you have a sunroof, the most common leak...

Q: Car sputtering when driving.

The problem is most likely a fuel related problem like a fuel pump that works but does not produce enough pressure and a fuel filter that is clogged and needs replaced. The recommendation is to get a qualified mechanic to...

Q: Steering wheel locked

I sounds like the ignition key lock cylinder may be worn out. Sometimes, the cylinder can be cleaned with electronic cleaner to free it up, but most of the time, the ignition lock cylinder assembly needs to be replaced. The...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.