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Oh, I see, you were talking about measuring across the GP relay. :unsure: I don't know why anyone would want to do that, unless maybe you were troubleshooting the relay itself. If it's working correctly, of course the input and output will have the same voltage when it's engaged. Can't be...

Or when the engine is on. Or anytime the GPs are not doing anything. You said it should be zero, and then you said it should be 12. I find that a bit confusing. ;) It should be ~12v when the GPs are heating. One of these days I should figure out what the voltage should be for every GP...

It can be done if: Specific questions are asked and answered to sort out the basic facts. People refrain from throwing "fixes" at the OP before what is actually going on can be determined. This is what causes confusion.

Yes. The question was not, "why is it there?" The question was, why does HE think that? What did he measure, under what conditions, and where did he measure it? He's made it clear that he doesn't understand electrical systems (which is not a problem - that's why you ask for help). That...

I'm well aware of how it works. I'm not well aware of what he's trying to say, and neither is anybody else. I'm trying to get him to clarify what he's done and what his statements actually mean. They are very ambiguous. For example, "23 volts running through the GP relay" doesn't really...

Check the resitance of the GPs to see if they are "It's not working." What is not working? The relay? The resistor? The truck is not starting? You have to be specific for us to help you. Why do you think the GP relay had 23 volts run through it? What is this about a "fire"? I see...