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The 1989 model is wired differently from the 1990 model. So this is for the 89 model only. You should have about 10 volts to the coil from a ballast resistor which gets power from the key switch. The ground side of the coil is handled by the distributor. Is the coil getting power from the key switch ?
there should be a white ballast resistor in the circuit to cut the amperage back on the coil. Check or replace ballast resistor sometimes they was mounted on firewall next to the ignition module either a 2 prong or 4 prong white ballast resistor.
Should be on the firewall,yes. Perhaps follow the wire from the coil back to the ballast.
I assume the truck fires then dies as soon as you let off the starter? That's how a bad ballast would act.
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