ok here we go, we have accuired a 1997 f350 crew cab 7.3 diesel.. the thing is , new o-rings, all the fluids,new filters,and new batterys.... heres the thing though! the cranking soild a smooth... but it will not fire off?come to find out the guy that had the truck first.,wired the starter cynlendoid back words and i think it fried the glow plug relay? my queston is ? am i on the right path here with replacing the glow plug relay? im new at the 7.3s but im hooked lol Thanks joe