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Toss in garbage Sorry you have 8 wires coming out of the GPM they go to each glow plug, you should have a red 10ga min. constant battery voltage and a key on power source too. then you should have 2 wires that go to the pcm, to activate the module. If you have your 2 power sources, and you ohmed out each glowplug should be around 5-6 ohms, and the pcm is reading the IAT and the ECT and EOT properly you have a bad module, if more than 3 glowplugs are bad or open it will shut down the module to protect it.
Thanks to Wood-N-Things I have the circuit diagram and pin breakout. But I have no idea how to test it.
If this diagram is right than just ground pin 101 that should turn on the glow plugs, but I dont think that diagram is the same as what you have, that a california model 7.3 from 2000. Always ohm your glow plugs, take your ohm meter and ground 1 lead and test each glow plug with the other, look for around 5 ohms on all 8. or else the pcm wont turn the module on.
Issues with 2000 excursion starting. Glow plug fault.
1FMSU43FXYEE is my vin
2000 excursion 7.3l 4x4 limited.
I have p0677 and p0671 which is glow plug 1 and 7 faults.
I pulled valve covers off both sides and pulled gasket wiring before it got dark.
I found that there is cracked wiring on the engine harness as well as the gasket wiring seemed smashed and cracked. Might have shorted out on head.
I ordered replacement valve cover gaskets from Amazon. But I want to order a replacement engine harness so I can have a fresh wire harness to last hopefully another 20+ years.
the question I have is should I swap the GPCM or just test it. Does this need to be tested in the truck or is there a way to bench test with a multimeter? If so how?
also I’m not sure it’s a California emissions truck. From what I have found during my hunt for information. If it had a GPCM and not dual relays it is a cali truck. I need to check under the truck to see if there is a cat.
im a fan of replacing everything that looks like it could cause problems in the near future. But does any of these aftermarket parts hold any weight. I plan to test the wiring in the valve cover before reinstall. I heard the aftermarket stuff can have issues.
for the engine harness I would hate to swap it all and then have an issue.
1FMSU43FXYEE is my vin
2000 excursion 7.3l 4x4 limited.
I have p0677 and p0671 which is glow plug 1 and 7 faults.
I pulled valve covers off both sides and pulled gasket wiring before it got dark.
I found that there is cracked wiring on the engine harness as well as the gasket wiring seemed smashed and cracked. Might have shorted out on head.
I ordered replacement valve cover gaskets from Amazon. But I want to order a replacement engine harness so I can have a fresh wire harness to last hopefully another 20+ years.
the question I have is should I swap the GPCM or just test it. Does this need to be tested in the truck or is there a way to bench test with a multimeter? If so how?
also I’m not sure it’s a California emissions truck. From what I have found during my hunt for information. If it had a GPCM and not dual relays it is a cali truck. I need to check under the truck to see if there is a cat.
im a fan of replacing everything that looks like it could cause problems in the near future. But does any of these aftermarket parts hold any weight. I plan to test the wiring in the valve cover before reinstall. I heard the aftermarket stuff can have issues.
for the engine harness I would hate to swap it all and then have an issue.
any help would greatly be appreciated.
Also this is the only part number i could find
First off I would only buy Ford Motorcraft parts or International parts for our engines. Dorman products are just subpar. Also all Excursions had the GPCM, doesn't matter if its a CA model or a FL model. All CA trucks had the GPCM but trucks made for the rest of the 49 states had a Glow Plug Relay.
YC3Z12B637BA
This IS your main engine wiring harness part # listed above. I got lucky and found it through my local Ford dealer who helped me by referring me to another dealer in Ohio. My harness was weak and needed more repair than I had time to do. These OEM harnesses are no longer being produced by Ford, but you may still get lucky and find one as I did from a dealer somewhere. If I remember correctly, the dealership that I purchased my harness from was Fairway Ford in Ohio. Good luck!
I know there is a small business in New Jersey, I think, that makes any type of harness you need for a vehicle. All you have to do is send them your old harness and they make it to spec and with new connectors. If I remember tonight when I get home to find the website/ phone number and post it on here for ya.
Ok I found the place I was talking about that makes wire harness and injection molding. Here is the link, https://www.narragansettreproduction...wiring-harness
They are located in Rhode Island, they're phone number is 401-364-3839
So I pulled the plugs and got new valve cover gaskets.
Here is the outcome.
1&7 didn’t even ohm out.
the rest tested ok kinda on the higher side.
I put new plugs in and am hooking up the harnesses for valve cover now. I would assume the engine harness is ok and I am going to leave it for now due to cost restraints.
I’ll update if this thing is back on the road this weekend.
02-08-2015, 01:28 PM
Sorry you have 8 wires coming out of the GPM they go to each glow plug, you should have a red 10ga min. constant battery voltage and a key on power source too. then you should have 2 wires that go to the pcm, to activate the module. If you have your 2 power sources, and you ohmed out each glowplug should be around 5-6 ohms, and the pcm is reading the IAT and the ECT and EOT properly you have a bad module, if more than 3 glowplugs are bad or open it will shut down the module to protect it.
