starter staying engaged; glow plug system faulty; alternator circuit?
My dad's 2000 7.3. Recent head job (cracked from running out of coolant). 250000 mi. auto.
Didn't start well--glow plugs were suspected.
Didn't crank--when they started it by manually arcing the starter, a transmission clatter was heard (intermittently).
I come on the scene: Checking into it, the starter problem is related to shift lever position sensor. So that works now by jiggling the lever. Cranks but wont start (it's cold).
Interesting pieces of information for someone to put together:
no power to the gpr 'in' terminal--power on the small terminals--whether I have the ignition off or on.
gpr relay clicks.
no power to the intake heater relay (?) right beside the gpr.--ignition off or on
don't know if ihr clicks or not--there are three volts on one of the main terminals
putting power to the fender mounted starter relay cranks the engine--ignition off or on
no power on the ALTERNATOR terminal--iooo
putting power with jumper wire to the alternator terminal CRANKS THE ENGINE--iooo
putting power to the gpr relay 'in' terminal cranks the engine--iooo
I believe the megafuse is blown. Little brother changed the alternator without removing battery cables. If I replace the fuse, the starter will go all the time (my jumper wire replicated this). Visual inspection of wiring harness done. Under dash fuses checked. This is too much for my little brain-- it needs more information, like maybe a good wiring diagram (I couldn't find one online--not a good one)
All brilliant and helpful comments welcomed and sincerely appreciated.