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I know where we are, the resistor will do nothing at all but cause an issue... it's a 12v system, if the resistor is removed and something stops working, great, know why? CAUSE IT WAS GETTING LESS THAN 12 VOLTS... I have said not to touch and to ignore other things... (no cranks, gp wires) but...

just want to make sure I have this right Top of relay has 3 wires 1 wire runs to the switch in the cab 1 wire runs to the x24v bus bar 1 wire runs to the resistor pack behind the firewall The small tabs are the tabs to trigger the relay er solenoid whatever... The orange is output... that...

Okay let me just make sure I understand you correctly Top of relay has 3 wires 1 wire going to the switch inside the truck 1 wire going to the 24volt bus bar (is this truck covered to 12v or still 24v?) 1 wire going to the resistor pack behind the air filter This wiring is er, interesting...

With out getting too far off, I would still test the glow plug system operation. When you say "Crank" crank means turn over, spin the engine... the motor would not even turn over, or it would turn over and not fire...? I just want to make sure we are both on the same page as to what "crank"...

OKay so the top of that relay is hot all the time correct? It is just power then to trip the relay assuming it is a power not ground activated relay. Use the test light turn the plugs "on" and check for power at the plugs, I would also check voltage at the plugs.

The test light method may work fine I do not know, but .8 to 1.8 ohms IIRC is correct for the plugs anything outside of that is "bad"... I would think the test light would only not light if the circuit was open. I would assume (maybe wrong) that plugs that are not good (outside of spec) may...

To quickly test, flip the switch to glow and make sure you are getting power to the plugs. Also how long are you holding this for your location is "new york" first thing in the morning you are looking at a good 10 seconds if not 15 of glow needed... I have also never used the test light to...

I would put it back to stock as the TM's show... For now I would assume that switch just engages the relay... when you hit it do you hear the relay click? If so check your glow plugs they may be burned out... Was this system ever working? Is the truck new to you first winter?