Battery light stays on - Ford Powerstroke Diesel Forum
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  #1  
Old 05-17-2014, 07:01 PM
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Battery light stays on

Hey guys,

My 99 (details in sig), the battery light stays on when the key is out of the ignition.

There is a major draw on the batteries. I havnt been driving it much, but it kills the batteries in less than 2 days.

Is this a bad ignition switch?

It only comes on when the key os off and out. It is NOT on when the truck is running. Just: Truck Off Key Out.


~ The Maddawg
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Old 05-18-2014, 12:29 AM
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That's weird. What's the voltage gauge reading when the truck is on? Just out of curiosity.
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Old 05-18-2014, 12:45 AM
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when the truck is off and battery light is on, pull out relays one by one until the battery light goes out. i'm thinking that there is a chance you have a relay that has welded itself into the on position.
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Old 05-18-2014, 12:56 AM
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now that i look at this diagram, it looks like you need a new alternator unless the voltage regulator on it can be replaced separately
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Battery light stays on-chargingsystem.jpg  
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Old 05-18-2014, 04:07 AM
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Just out of curiosity, how Shi you get that from the diagram?

I'll check out as soon as I can!

~ The Maddawg
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Old 05-18-2014, 04:24 PM
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It looks like the battery light in the cluster is controlled by the regulator. It looks like thebregulator might not be turning off when the key is off.

I've heard of alternators draining the battery with the vehicle off. It looks like the regulator is a part you can change out separately. It just bolts into the alternator.

Don't quote me on this. I'm not sure how the regulator is controlled to go off.

Try unplugging the regulator to see if the battery light goes out when the truck is off.
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Old 05-20-2014, 07:06 PM
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OK, so I was charging my battery on the passenger side. I purposefully left the cables ON but disconnected the other battery. After 2 days on a trickle charge, I was just at 25%. I felt the back of the alternator and it was WARM to the touch. The battery light was on inside the cab.

After this week Im just gonna replace the alternator, its obviously shot.
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  #8  
Old 05-20-2014, 09:11 PM
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Did you try pulling relays one at a time to seeif one of them turns the battery light off?
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