Check fuses.Then check the glow plug relay 7.3l has relay mounted on front top of engine looks like a starter solenoid.... Switch truck ignition on to the normal preheat position, u can use insulated screwdriver or the like to touch the 2 larger bolts (of the four total) at the same time in order to make them 'connect'... hold this for about 30 seconds.. to activate glow plugs... if engine starts, sounds like u need GP relay. If truck doesnt start you may have 'under valve cover' wiring problem. DO NOT use ether to start your truck it will cause damage to your engine.
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