hard/no start glow plug harness?
Thread Starter
|
Tuned
Joined: Oct 2015
Posts: 262
Likes: 0
From: Roswell
hard/no start glow plug harness?
Met a guy today in my area that has an 02 7.3L. He had the issue with hard/no start unless he plugged his truck in. He said that he replaced a wiring harness and he looked at a picture I had of the truck and he was pointing at the glow plug relay. He said the part was a wiring harness. I don't have my truck right now to look at it but he's probably talking about the glow plug wiring harness, right? I'm tempted to replace that, he said about $50. Worked for him, think it will work for me (if you've followed my other threads). Does it have to be from Ford or can I get one from the parts house? Should I replace anything else while I'm at it? (My glow plugs tested good with AE).
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
How cold is it where you are? As things warm up, you should be able to start your truck without the aid of glow plugs.
If you suspect the GPR is bad and causing a hard start, take a screw driver and lay it across the two big posts on the GPR for 45 seconds, then try to start the truck.
It might spark a little at first, but what you're doing is manually bypassing the relay and energizing the glow plugs with the screwdriver.
If you suspect the GPR is bad and causing a hard start, take a screw driver and lay it across the two big posts on the GPR for 45 seconds, then try to start the truck.
It might spark a little at first, but what you're doing is manually bypassing the relay and energizing the glow plugs with the screwdriver.
Thread Starter
|
Tuned
Joined: Oct 2015
Posts: 262
Likes: 0
From: Roswell
hard/no start glow plug harness?
How cold is it where you are? As things warm up, you should be able to start your truck without the aid of glow plugs.
If you suspect the GPR is bad and causing a hard start, take a screw driver and lay it across the two big posts on the GPR for 45 seconds, then try to start the truck.
It might spark a little at first, but what you're doing is manually bypassing the relay and energizing the glow plugs with the screwdriver.
If you suspect the GPR is bad and causing a hard start, take a screw driver and lay it across the two big posts on the GPR for 45 seconds, then try to start the truck.
It might spark a little at first, but what you're doing is manually bypassing the relay and energizing the glow plugs with the screwdriver.
It won't hurt anything doing that?
Senior User
Joined: Apr 2016
Posts: 113
Likes: 0
From: Central, TX
Comsupany, my guess is that you need a GPR. I haven't read your other threads, but here's how you find out, without any screwdriver welding:
Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
I highly recommend getting the Western Snow Plow relay (Western 56131K-2), or the Stancorp relay from dieselOrings.com, instead of Ford. The reason is higher duty cycle and much lower price. The western is @ $23 on e-bay.
Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
I highly recommend getting the Western Snow Plow relay (Western 56131K-2), or the Stancorp relay from dieselOrings.com, instead of Ford. The reason is higher duty cycle and much lower price. The western is @ $23 on e-bay.
Thread Starter
|
Tuned
Joined: Oct 2015
Posts: 262
Likes: 0
From: Roswell
hard/no start glow plug harness?
Comsupany, my guess is that you need a GPR. I haven't read your other threads, but here's how you find out, without any screwdriver welding:
Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
I highly recommend getting the Western Snow Plow relay (Western 56131K-2), or the Stancorp relay from dieselOrings.com, instead of Ford. The reason is higher duty cycle and much lower price. The western is @ $23 on e-bay.
Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com
I highly recommend getting the Western Snow Plow relay (Western 56131K-2), or the Stancorp relay from dieselOrings.com, instead of Ford. The reason is higher duty cycle and much lower price. The western is @ $23 on e-bay.
Trending Topics
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Something I am wondering here...comsupany says that he has checked his glow plugs with AE, a GPR is being referenced. Can AE test glow plugs? Or are we talking about a glow plug module? If there is a glow plug module is there also a GPR? 
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
Tuned
Joined: Oct 2015
Posts: 262
Likes: 0
From: Roswell
This is a screenshot of the test results.
Fleet Mechanic
Joined: Aug 2006
Posts: 1,465
Likes: 17
From: Jacksonville, FL
So you must a CA truck? The "regular" non extra emissions only had a GPR, whereas you have a module, this monitors each plug and will tell you if one is bad.
I have never ran a glow plug Check in my truck as I just have a GPR (it's one or the other) so I don't know for sure if the truck will show a good test if the truck doesn't actually have a GPM.
I have never ran a glow plug Check in my truck as I just have a GPR (it's one or the other) so I don't know for sure if the truck will show a good test if the truck doesn't actually have a GPM.
Former Vendor
Joined: Mar 2016
Posts: 125
Likes: 0
Met a guy today in my area that has an 02 7.3L. He had the issue with hard/no start unless he plugged his truck in. He said that he replaced a wiring harness and he looked at a picture I had of the truck and he was pointing at the glow plug relay. He said the part was a wiring harness. I don't have my truck right now to look at it but he's probably talking about the glow plug wiring harness, right? I'm tempted to replace that, he said about $50. Worked for him, think it will work for me (if you've followed my other threads). Does it have to be from Ford or can I get one from the parts house? Should I replace anything else while I'm at it? (My glow plugs tested good with AE).
Senior User
Joined: Apr 2016
Posts: 113
Likes: 0
From: Central, TX
I'm partial but I would definitely stick with OE, it seems that these diesel trucks prefer Ford/Motorcraft parts. Looks like the part number is F81Z-12B533-AC for the relay based upon my catalog info and that linked thread as well.
The link above covers what to do after the GPR checks out, but I don't have a Cali truck, so no advice there.
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
Now I remember checking the GPR as shown in that link back 6 months ago. It checked out. The voltage was 11 or 12 volts for a minute or so then went to zero--if I remember correctly. I haven't ever checked the glow plugs except that AE tested them fine!? When you meter the connector is it the connector on the valve cover or the connector you unplug and is in your hand?
