Truck wont shut off by key/glow plug issues (5 speed 97) - Ford Powerstroke Diesel Forum
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Old 10-13-2013, 08:24 PM
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Truck wont shut off by key/glow plug issues (5 speed 97)

I recently bought a 97 f250 4x4 5 speed regular cab. Alot of things seem to be butchered on it. First of all it was previously swapped from an auto to a manual. Also, it will start by key, but it wont shut off, i have to stall it out. Also, on cold days to actuate the glow plugs, I have to hold one of the wires to the glow plug relay for a few seconds then i start it. Also i was told to unhook the batterys when not running because it has a stationary draw of some sort. So where the heck do I start to get things right? I bought her for 2 grand with 221k on it last saturday, drove it home about 100 miles.
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Old 10-14-2013, 07:01 PM
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Any ideas or do i just have to find somebody good with electrical around here
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Old 10-14-2013, 07:14 PM
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Check your harness in the steering column, and try tracing a few wires, check the fuses as well
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Old 10-15-2013, 11:09 AM
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I can't for the life of me find my wiring diagram for the PCM wiring. My best guess is that instead of doing the clutch bypass correctly the PO buggered up the power distribution box under the hood. Something like the key switch to a relay (probably added to the system) to all the relays on the PDB under the hood. If the relay was not set up correctly (latching relay or self grounding probably) it will have a key on / positive hold. Meaning that once you apply power to the relay the relay self grounds to the chassis and it has it's own positive power source (through a gate inside of the relay to use the bridged power to the PDB to hold it closed) to keep the relay holding on. Stalling the truck would shut off the motor but since the relay is holding in the "on" position this is the source of the electrical leech. The PDB is still live after turning the truck engine "off" and the PCM, IDM, and the internal cab circuitry is still active (like the gauge cluster and such).

Here is the Ignition Switch schematic:




EDIT: PCM pinouts:



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Old 10-15-2013, 01:23 PM
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Do the glow plug jump as you usually do. Then, remove ALL wires to the glow plug relay, tape off the hot ones, and start it up, and attempt to shut it off. See if it shuts off normally with the glow plug relay COMPLETELY disconnected. GP relay issues, or the wrong relay, can make this happen.
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Old 10-15-2013, 03:46 PM
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Thanks alot guys, really appreciate it
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