Glow Plug System
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Glow Plug System
Does anyone have info on the glow plug system? As far as what components are involved what wires go where and what voltages should be found and where? On my 1996 F350 7.3l PSD I have put in new glow plugs replaced the relay with the Stancor 586-902. It seems I still have the issue of them not working. It looks like all my fuses and connections are good.
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Joined: Oct 2004
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From: FL
Look at mq1shooter's links in the below link. Hope that helps
https://www.ford-trucks.com/forums/4...ml#post9616403
https://www.ford-trucks.com/forums/4...ml#post9616403
Post Fiend
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From: Nutter Fort, WV
Fusible links protect the glow plug relay power supply side.
With a new relay and new glow plugs, my next check would be if battery voltage is present on one of the large studs on the relay.
Key on power should be on one of the small terminals, looks like red/green stripe wire.
Ground to close the relay is supplied by the PCM to the other small terminal on the relay.
The other large terminal on the relay is the glow plug harness connection, looks like brown for a color.
With a new relay and new glow plugs, my next check would be if battery voltage is present on one of the large studs on the relay.
Key on power should be on one of the small terminals, looks like red/green stripe wire.
Ground to close the relay is supplied by the PCM to the other small terminal on the relay.
The other large terminal on the relay is the glow plug harness connection, looks like brown for a color.
Post Fiend
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From: Nutter Fort, WV
So the fusible link for the battery power is blown.
I think that wire should be about a #6 AWG wire, black and orange and should run to the starter relay behind the passenger side battery.
There should be a fusible link close to the starter relay.
Also check and see if that wire is unhooked or broken where it hooks to the battery side terminal of the starter relay.
By battery side, I mean the terminal that always has battery power.
I think that wire should be about a #6 AWG wire, black and orange and should run to the starter relay behind the passenger side battery.
There should be a fusible link close to the starter relay.
Also check and see if that wire is unhooked or broken where it hooks to the battery side terminal of the starter relay.
By battery side, I mean the terminal that always has battery power.
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I see the black wire with the orange stripe. there is also a small yellow wire with it too. coming off the constant hot side of the starter relay it is a eye terminal with two gray wires in it. then it goes under a piece of heat shrink that says fuse link on it and on the other side of the that it switches to the big black wire with the orange stripe on it plus the little yellow wire. I have voltage on both sides of the heat shrink that says fuse link on it. But it looks like that harness goes to the back of the alternator? Am i being stupid and looking at the wrong wires? On the switched side of the starter relay i have another eye terminal with two green wires under it the same size as the two gray ones on the other side. The two green ones shoot off in a loom that goes across the top of the engine.
Am i just being stupid and looking to far into this? Is my truck wired wrong? Anybody got any actual photographs of the wires of a working glow plug system?
Am i just being stupid and looking to far into this? Is my truck wired wrong? Anybody got any actual photographs of the wires of a working glow plug system?
Post Fiend
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From: Nutter Fort, WV
One of the large terminals on the glow plug relay should be hot at all times.
Mine is a 97, and that wire is black and orange.
If you do not have power there, I would trace it back to find where it loses power at between the glow plug relay and starter relay.
Right now I can't remember if that is the same wire the alternator uses for power out or not.
Given the proximity of the glow plug relay to the alternator and the fact that the amp load is about the same, that would make sence for the factory to do that and save a few cents.
Mine is a 97, and that wire is black and orange.
If you do not have power there, I would trace it back to find where it loses power at between the glow plug relay and starter relay.
Right now I can't remember if that is the same wire the alternator uses for power out or not.
Given the proximity of the glow plug relay to the alternator and the fact that the amp load is about the same, that would make sence for the factory to do that and save a few cents.
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OK, Thx Dave!
Knowing one side of the glow plug relay is supposed to be hot all the time helps me a bunch. I will start tracing wires hopefully tomorrow.
Knowing one side of the glow plug relay is supposed to be hot all the time helps me a bunch. I will start tracing wires hopefully tomorrow.
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