2002 ford f350
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4th Gear
Joined: Jun 2023
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2002 ford f350
Battery light stays on, if I unplug the alternator the light comes off, plug it back in light stays on.. alternator is good, (just replaced it) batteries are good (new) battery cables are good, pcm is new, bcm is also new, tore out the wire harness, it's also good, checked all fuses also good, cleaned all the grounds and added new ground also.. currently looking at the gage cluster, if that isn't it then I'm out of ideas.... I am stumped and annoyed with this customers truck.. PLEASE HELP HAHA
Update, not the gage cluster...
Update, not the gage cluster...
Last edited by Caseyrae86; Jun 8, 2023 at 08:34 PM.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
The cool thing (not really) is that the 02-03 7.3s rely on the PCM for alternator field control AND the light in the cluster.
However, the regulator in the alternator is what grounds the circuit for the warning indicator when it's no good. Lots of aftermarket alternators have issues with the regulator attachment screws coming loose and falsely tricking the regulator into thinking something is amiss even though the charging portion works fine.
However, the regulator in the alternator is what grounds the circuit for the warning indicator when it's no good. Lots of aftermarket alternators have issues with the regulator attachment screws coming loose and falsely tricking the regulator into thinking something is amiss even though the charging portion works fine.
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4th Gear
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We've checked all that, about to wrap it up and tell the dude to take it somewhere else.. 🤷♀️🤷♀️
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Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
"PCM is new"
What PCM is in it? An earlier-than-2002 will cause the truck to run but the battery light will be on. I'm looking for 6 digits (DPC-4xx).
What PCM is in it? An earlier-than-2002 will cause the truck to run but the battery light will be on. I'm looking for 6 digits (DPC-4xx).
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