i have a 1997 ford f150 i replaced the GEM and fuse box i have bought 1 new gem an 3 used ones none worked. at first the truck would not crank the windows quit and the wipers quit when i replaced the gem an fuse box all this started working but now the plugs have no spark and no fuel pressure to fuel system i have fire to the coil packs but the plugs do not fire any ideas pleas i am now lost
It's hard to tell what you got into.
First, there are fuses involved with the PCM.
If one for the PCM is open the motor can still crank but nothing else will happen.
The coils have their own feed but unless the PCM addresses them by grounding the correct coil in the fire order, the motor won't run.
If the PCM has no power, likewise it cannot offer a ground to the fuel pump relay circuit
My guess is you lost power to the PCM for some reason.
Also if the PATS is out of power the motor won't start.
Not much help but to give some info to run with.
not sure what the pcm is, is that the gem? if not i will check it. am totaly lost will try anything. to recap what was rong and what i have done.
problems in order...
power windows quit
interior lamps flashed
head lights quit
truck quit starting
truck would not turn over with key but would if you crossed solenoid
put on two used gems then bought a new gem
replaced fuse box
(all started working but no spark or fuel pressure)
have power to coil packs from wiring harness
have checked all fuses and mega fuses