Ammeter pegged...
Just a tidbit of possibly related info. A couple days ago I opened up my engine harness because the "blue" wire was melted inside of it. I found the burnt section ended prior to any real damage, but the cause was that the previous owner had installed an aftermarket carburetor and left the electric choke lead (I think) hanging free. Without a shielding cover. It grounded on the intake and melted the wire right back to the ballast resistor. I'm sure when it happened to him the ammeter was acting up and showing some info as well. I am not aware as I have disconnected it.