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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