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I chased down the same problem on my 02 F350. Although I know I fried my PCM output to ground the GPR with a wrong GPR. It's recomended to ohm out the wire from the GPR to the plug on the back of the PCM. Keep in mind to properly confirm operation of the GP & GPR the engine needs to be cool and the outside temps should be cool to confirm that the PCM should be calling for the GPR to come on.
2002 F350 Crew Cab SB 4X4 7.3L Auto,DP 40,60 tow,80 econo,isspro 3 gauge pod,ATS ported turbo housing,ITP boost fooler,in tank mod,Dino Fuel CCK Kit,HPX oil line,Turbomaster Wastegate,4" Turbo back Dynomax Exhaust,AIH delete,CCV mod,Napa 6637 filter,Bully Dog tranny spring kit,6.0 tranny cooler.
I'm sure I forgot something! many things!