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Antennaclimber, It was in an earlier post you said open circuit=high resistance and that is also how I see it if there was a circuit, and no resistance to me means no drop in voltage, but I'm not very good with electrical problems. The new temp sensor gave me a a long wait light and the truck...

antennaclimber, I think I know what you mean, but you said that no resistance = open circuit. If the circuit has no resistance as in closed circuit the wait light won't come on. High resistance the wait light will stay on.

Is it a good guess that the temp sensor is bad because the temp sensor is not showing any resistance when it is plugged in and the engine is cold? I will know tomorrow because will pick up the one I ordered from Napa.

I know the basic operation, but don't understand what is going on when something goes bad. Why does the wait light stay on with the temp sensor removed? I have another truck that has manual glow plugs and the wait light goes off on on randomly(GP card removed) as you're driving. Things like that...

My truck was starting correctly, but now I don't get a wait light and no power to the glow plugs. I removed the connection to the temp sensor and I do get the wait light that stays on, but still no power to the glow plugs. I know the temp sensor tells the system to activate when cold and not...