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I'm about to buy a 91 F250 sc 4x4 7.3. I know the gp's don't work on it so my question is where do I start first to get the system working? Any input will be helpful.
Step one.... read the stickies.
step two..... buy truck if it is what you want and a decent deal.
Three... use what you learned in the stickies to diagnose the glow plugs.
Don't post anymore questions on the glow plugs until you've read through the stickies, the answers are there, trust us. Don't tell the current owner how easy the system is to fix (it is pretty easy unless the wiring is royally screwed), it could be a good bargaining point to drive the price down.
But please post up some pictures if you get the truck, and feel free to browse around and search if you have other questions, there's a lot of good knowledge on here.