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I have never had one hang, that is unusual but yes that will kill them. OP is pretty new so I wanted him to be aware of the resistor and it association with killing glow plugs.

glow plug relay will not kill glow plugs. The resistor on the firewall goes bad and causes the plugs to go bad. with ignition on you should have power to glow plug relay and pink solenoid on IP. if you do not then find your power problem first. Then check both solenoids if they both work...

the glow plug solenoid should be the loud click. The Ip fuel solenoid you can hear with engine off and glow plug relay not operating. run a wire from front batt to where the pink wire connects and just touch the terminal with the hot 12 volts with the pink wire removed, ignition off. you can...

the slow start over time is glow plug but the no start then sudden start is your fuel shutoff on the IP. It can stick shut and cause it not to start, eventually it opens but after the glow plugs have already cooled. I bet your IP is going bad. turn the ignition on and pull the pink wire on...