[dmjlambert]

The only purpose the resistor wire serves is to make your points last longer. So you can decide if the truck still runs but could use new points every 15K miles or so, you have enough resistance. The resistor wire probably goes from the firewall connector to the yellow wire where the engine harness goes down to the transmission bell housing bolt on the passenger side where there is a wire holder. There it probably connects to a yellow wire that goes between the starter and coil.