It has nothing to do with the engine you stuck in.
It all about how much you swapped over from your 6.9. 6.9 and 7.3 are the same engines. 7.3 just has a sligthly larger bore.
6.9s up to the end of 1986 use the thermal-controller and the HDS 305 glow plugs.
6.9 in 1987, and the later 7.3s (1988-1994) use the electronic controller and HDS 307 glow plugs. Same as Delco 32G, Champion CH84, Beru 0 100 271 101, Bosch 0250 202 254, Ford Motorcraft ZD9, Lucas DS092A, etc.
I have no idea how much of your original truck wiring you kept. Maybe that's your problem?
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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