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WIF light comes on. All dash lights work as they should. Fuses and connections are good. relay clicks. Glow plugs were just replaced with new ones. Truck is VERy hard to start in the cold. Once wam, it fires right up. Im thinking the Controller Card is bad, just trying to get a second...

So if the wait light does not light up (and it's not due a bad bulb/ bulb wiring) then can the culprit be assumed to be the controller card? Or could there be other causes. The GP relay does click when the key is turned...

Here is a question. Would a bad controller card make the wait to start light NOT light up?

#1, fix your wait to start light.....................................