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I have a 1994 f-350 7.3 IDI . the glow plugs started giving a problem a short time ago. the wait to start light comes on and then goes right out with out heating the plugs. I replaced the relay but it didn't fix the problem. when the switch is turned on the contacts in the relay keep clicking on and off. I also replaced the engine coolant sensor . the glow plugs are ok, I replaced one of them. It is hard to find a wiring diagram for the IDI engine. Is there any other control that tells the relay to engage, and for how long?