Re: Truck now won't run
The ammeter measures ALL the current going into or out of the battery except for the current which spins the starter. When you removed the ammeter, you effectively cut off all power to the rest of the truck. To run without it, you must connect (to each other) the cut ends of the wires which formerly connected to the ammeter. This needs to be done with fairly heavy wire, say about 10 gauge. A non-shunt ammeter such as you have is the ONLY dash gauge which works this way. Don't try it with anything else.
Ray
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