battery light

Reply Subscribe

Thread Tools

Search this Thread

Apr 23, 2011 | 08:10 PM

bluetazmanian

Thread Starter

New User

Joined: Apr 2011

Posts: 1

Likes: 0

battery light

I keep getting the battery light on the dash even though I have changed the battery and have 12.2 volts comming off the altenator. What else could cause this problem?

Apr 23, 2011 | 08:57 PM

FireMe

Elder User

Joined: Nov 2008

Posts: 668

Likes: 6

From: Northfield, MI

You aren't supposed to have 12.2 coming off of the alternator with the engine running. It should be around 13-14.5v. If you don't have that, you need to diagnose the charging system.

The battery light is for the charging system, not the battery itself.

Apr 24, 2011 | 08:41 AM

jh818

Cargo Master

Joined: Jul 2009

Posts: 2,885

Likes: 24

From: Chino, California

Your alternator may be bad. New batteries have 12.5 V. Sounds like with your engine running, you are drawing some power off the battery and no power is coming from the alternator.

Apr 24, 2011 | 09:19 AM

Hotpocket

Elder User

Joined: Nov 2010

Posts: 946

Likes: 0

From: Needville, TX

defiantly the alternator... just went through the same prob myself on my 5.4...i let it get so weak it took my guages to go crazy on a ride home to make a stop a the auto parts store on the way home.. had 12.1v coming out the alternator before......14.4v after..