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Took the instrument cluster out and the leads running to the DC Amp meter were fried. My guess is the PO probably thought it operated like a regular volt meter?
My guess would be that someone shorted out the alternator during a repair at some point.
That's possible. Does someone know where the shunt is for the amp meter on a 1977 F250? I'm also wondering if the shunt was removed or bypassed thus passing all the current though the amp meter.
I restore the 73-79 clusters, & have gone thru a couple hundred of them. Some for parts, some get restored. The amp gauge trace burning up does happen, I've had at least 10+ of them like that. As far as I can tell, the amp circuit doesn't have a fuse, so the PC acts as the fuse when something goes wrong.
I haven't figured out what goes wrong to burn them up. I haven't had a harness to cut up to see exactly where the shunt is, & how it is wired in. I'm sure it is caused by someone doing something they shouldn't, like hooking the battery up backwards, or pulling the positive cable off the battery while the truck is running.
I have also seen a couple of the 80-86 clusters burned up the same way.
scott scott i thought for a second you did the yt video i just watched but his name is BJ. My 56 chevy has an actual amp meter with ALL my trucks current going thru it. a lot of people change them to volt meters. probably to avoid what happened here. it looks like they wired it like my truck is.
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Dayum! 
Curious myself.
