2004 excursion “I messed up”
Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 534
From: Rock Hill, SC
You may have suffered PCM damage, my original suggestion was to have the alternator checked, and would still be a valid check point, the voltage regulator probably got damaged. But you may have more going on now.
Laughing Gas
Joined: Jun 2021
Posts: 983
Likes: 366
Looks to me like your alternators voltage regulator got fired. When voltage drops below 10 things start to shut themselves off. The voltage regulator is available separately from the alternator (link to just one example below).
https://www.summitracing.com/parts/SMP-VR455/applications/engine-type/v8/year/2004
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https://www.summitracing.com/parts/SMP-VR455/applications/engine-type/v8/year/2004
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5th Wheeling
Joined: Dec 2021
Posts: 34
Likes: 2
ok, I put in a known good PCM and I think I’ve ruled that out. Judging by the voltage readings I’m hoping it’s the regulator in the alternator. I will keep you guys posted. I have not done the one fuse at a time thing yet.
Fleet Mechanic
Joined: Oct 2010
Posts: 1,407
Likes: 155
From: Milwaukee, WI
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5th Wheeling
Joined: Dec 2021
Posts: 34
Likes: 2
It seems to be acting fairly normal KOEO actually. Voltage is odd, batteries read 12.5 but the sct only shows 10.5. The company I bought the alternator from thinks voltage regulator so they are going to replace that. Unfortunately it’s uses a smaller pull and belt so my old alternator won’t even go on to test without getting a new belt so since they are paying shipping I’m just going to wait.
Cross-Country
Joined: Feb 2022
Posts: 52
Likes: 11
From: Chester Springs
I've had many shorts with fountains of sparks over the years and usually the only damage is to the battery and my pride... Easy thing to try is swapping in another battery (or two) or just attach some jumper cables to an idling nearby vehicle's battery, then see if you still get the flashy flash on the dash.
Veteran/Sheepdog
Joined: Feb 2012
Posts: 6,047
Likes: 110
From: Western AR
The over-current condition you experienced melted wires/contacts somewhere from the battery+ to the main fuse box. I bet you (or someone you hire) will have to go through it inch by inch to find the "melts".