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Those civy controllers fail a lot. They were designed for 6V 'fast glow' (fast blow) system. If you are getting 12v from controller it is probably bad. If you ground to terminal with light blue wire on glow plug relay (solenoid), with ignition on, it should active relay. If you add...

I have not had this problem. My CUCVs were all out working before I got them. Two are 12V and one is 24V start but messed with. None use the 24V to !2V resistor. All have 12 V coming from glow soleiniod. This is also true of my K-30s which were 6v glow. The AC -12 Gs have worked for me...

Re Obsolete glow plugs. Thanks for the info. Does self limiting mean they won't overheat?

Re Obsolete glow plugs. Thanks for the info. Does self limiting mean the wont overheat?

I,ve changed most of my 6.2 fleet (7 trucks) to manual control as the factory systems have failed. I jump ground to glow plug control solenoid as described by others. Be sure to use 12 or 13 volt glow plugs on this conversion. The civilian 6.2 used a 6v fast glow plug ( ie AC G-9). This plug...