Battery Light(DIM)
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New User
Joined: Nov 2009
Posts: 9
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From: Philadelphia
Battery Light(DIM)
I have a 99 F250 with a 5.4L and my battery light came on the other day, but its very dim and at idle it flashes alittle. Today i drove the truck to work(did not notice a huge change in the volt gauge) and came out 20 min later to a close to dead battery, so i replaces the battery and the light is still on. The alt. is only 4 years old. Any ideas??????????????????
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Let the truck sit overnight and cool off. When you go to start it the next day, pop the hood and feel the alternator BEFORE starting it up. If it feels warm, something in the alt is bad (I can't remember what exactly, diodes maybe) and is draining the batteries.
Another thing to check is the plug on top of the alt. Those wires control when the alt turns "on" and a bad connection here can cause it not to charge so well. Make sure the connector is plugged in completely and that none of the wires are loose or the pins in the connector are corroded. If you don't get many replies, post this in the 99-03 7.3L forum thats further down on the main page. We deal with those trucks specifically.
Another thing to check is the plug on top of the alt. Those wires control when the alt turns "on" and a bad connection here can cause it not to charge so well. Make sure the connector is plugged in completely and that none of the wires are loose or the pins in the connector are corroded. If you don't get many replies, post this in the 99-03 7.3L forum thats further down on the main page. We deal with those trucks specifically.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
Yes, it is the diodes in the alternator that usually cause this. Despite the fact that the alternator is 4 years old, it probably needs to be replaced.
VANHORN - Welcome to FTE. Could you please not post with your CAPS LOCK on? it makes your text very hard to read.
VANHORN - Welcome to FTE. Could you please not post with your CAPS LOCK on? it makes your text very hard to read.
Posting Guru
Joined: Mar 2005
Posts: 2,060
Likes: 7
From: Burnsville, MN
Now that's interesting. A new alternator AND and new battery, and the light is still on....
Yes, I know, the new alternator could be bad, but you know what? I would get someone, like a spouse or girlfriend, to watch the light while the truck is running, and individually remove and reinsert all of the fuses in the fuse box.
If you find one which forces the light off, then you at least know the circuit. Otherwise, yes, you probably have a bad alternator....
And yes, you'll know when you remove the fuse for the computer.....
Yes, I know, the new alternator could be bad, but you know what? I would get someone, like a spouse or girlfriend, to watch the light while the truck is running, and individually remove and reinsert all of the fuses in the fuse box.
If you find one which forces the light off, then you at least know the circuit. Otherwise, yes, you probably have a bad alternator....
And yes, you'll know when you remove the fuse for the computer.....
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