Blower does not work and other electrical issues

IRLEFTY

MEMBER
2004 OLDSMOBILE ALERO
4 CYL
FWD
AUTOMATIC
49,000 MILES

A/C blower does not work; radio turns on on Accessories, but not when engine running and goes on when engine is turned off; power windows do not work; headlights do not work on Auto, come on when engine is turned off; instrument panel gauges do not work. Dome light, blinkers, door locks and wipers OK. Installed new battery yesterday - all worked fine this AM, not this afternoon.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

There are several things that can cause this, but we should start with picking one of the systems that are not working and figure it out and if that fixes everything then that is great. However, if not then we move onto the next things.

I would suggest starting with the blower motor and work through the system and find where you have power.

You should have 12 volts at the blower when it is on high and if you don't then we need to go back to the relay and then the resistor.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-wiring

So, we lastly check the fuses, but I assume they are ok unless you have a lot of fuses blown.

I am attaching the wiring diagram below which is what we will need to check all this so let us know what you find with this.

Please run through this and let us know what you find.

Thanks

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