Is anyone using a manual GP setup on an 82 or 83 engine? I am working on a truck that has an "Assembled From Parts" title and it has a 1982 6.2 in it. The wiring was a mess including the GP circuit. There was an attempt to set up a manual system somewhere along the life of this old girl but but when I got the truck it was incomplete and really patched together. The relay already had battery power to a terminal and the GP cables attached to another (3/8" terms.) and from looking at the picture of the relay setup in the 82 GMC service manual that part looked right. The other two terminals, one labeled "S" and the other "I" had nothing attached. I was told that one of the small terminals gets "Power on Run" and the other gets a wire run to a push button and then to ground. After looking at the factory wiring diag.. this appeared obvious. The power circuit goes to the GP relay, the fuel shut off solenoid and also the cold Idle/cold advance solenoids through the temp. switch and then the GP relay must fire with the controller by grounding through its functions. What I'm finding with my relay is that if I put power to the "S" terminal the relay fires. That terminal has continuity to the mounting flange and grounds that way. I can't get any type of reading, voltage or continuity on the "I" terminal. It appears that I have an internal malfunction on the relay to me. Even though I can power the GPs with power to the "S" terminal. I would think that I should have continuity from the "S" to the "I" not to the mounting bracket in order to ground from "I" terminal. Am I going down the right road here? Is a new relay needed?