W150 1/2 Ton Pickup 4WD V8-318 5.2L VIN T 2-BBL (1983)
Starter Relay: Testing and Inspection
Place transmission in Neutral and apply parking brake.
Check for battery voltage between starter relay battery terminal and ground.
Connect jumper wire on starter relay between battery and ignition terminals.
If engine does not crank, connect a second jumper wire to starter relay between ground terminal and good ground and repeat test.
If engine cranks in step 4, transmission linkage is misadjusted or neutral safety switch is defective.
If engine does not crank in step 4, starter relay is defective.