Dandy. Unfortunately, the diagram I'm working from doesn't list the normal relay terminals. I have to go by wire colors. If you found 12 volts on one terminal, that's all you should have. Two other wires should have continuity to ground. One will be reading through the fuel pump motor so be sure that is plugged in. The other one is a ground wire for the relay's coil.
The clinker with the fuel pump wire is that circuit also feeds all the injectors. The injectors will be turned off so those will be open circuits, but if you don't read to ground through the pump, suspect a bad ground on the fuel tank. That was real common on S-10 steel tanks when the trucks got rusty. To fix that, drill a hole in the tank's flange outside of the welded seam, then run a self-tapping screw in there. Attach a wire to it, and to the frame to repair the ground.
The fourth wire gets 12 volts from the Engine Computer to turn the relay on. That should occur for just one second after turning on the ignition switch. After that, the voltage should reappear during engine rotation, (cranking or running).
Tuesday, March 10th, 2015 AT 6:19 PM