Re: Truck won't start ?
There should be a resistor wire in the wire from the switch to the coil.
The jumper wire between the positive post on the battery and the switch side of the coil is probably the quickest way to eliminate other problems. If the truck runs then you can trace back through the circuit and find the problem.
Other things to look at.
Wire from switch to coil not connected. The resistor bypass wire from the starter sounds like it is connected but the wire from the switch may not be if someone separated them at one time.
The same wire broken. Those 40 year old wires are a bit fragile at times and don't like a lot of moving around.
Bad switch. You can test this with a test light or multimeter.
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