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Re: Ignition problem
The 2 screw terminals on the horn relay serve as a main power distribution / junction block on these trucks. And there is a main feed wire that runs from the positive battery terminal, across the radiator support, and connects to one of those screw terminals.
A bad connection at either end of that main feed wire will cut off power to the rest of the truck. The ammeter is connected in parallel with that wire (it serves as a shunt) so that could explain the meter pegging to the discharge side when you turn the key on.
So I would recommend checking the connections at both the positive battery terminal and at the screw terminals on the horn relay.
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