Block Heater
More Turbo
Joined: Mar 2006
Posts: 582
Likes: 2
From: Eads, TN
That means your relay is BAD. 
With the positive on the plug side of the relay and the negative grounded with the key to the "ON" position and you get zeros on the meter, it means that your relay is bad and no power to the glow plugs. Also, make sure that you are getting 12-13 volts on the battery side post which is the other larger post on the relay which is on the passenger side. The post should read about the same voltage as your battery. Your ignition does not have to be on to get this reading.
With the positive on the plug side of the relay and the negative grounded with the key to the "ON" position and you get zeros on the meter, it means that your relay is bad and no power to the glow plugs. Also, make sure that you are getting 12-13 volts on the battery side post which is the other larger post on the relay which is on the passenger side. The post should read about the same voltage as your battery. Your ignition does not have to be on to get this reading.
Thread Starter
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Senior User
Joined: Jun 2013
Posts: 392
Likes: 0
From: Paw Paw
That means your relay is BAD.
With the positive on the plug side of the relay and the negative grounded with the key to the "ON" position and you get zeros on the meter, it means that your relay is bad and no power to the glow plugs. Also, make sure that you are getting 12-13 volts on the battery side post which is the other larger post on the relay which is on the passenger side. The post should read about the same voltage as your battery. Your ignition does not have to be on to get this reading.
With the positive on the plug side of the relay and the negative grounded with the key to the "ON" position and you get zeros on the meter, it means that your relay is bad and no power to the glow plugs. Also, make sure that you are getting 12-13 volts on the battery side post which is the other larger post on the relay which is on the passenger side. The post should read about the same voltage as your battery. Your ignition does not have to be on to get this reading.
Thread Starter
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Senior User
Joined: Jun 2013
Posts: 392
Likes: 0
From: Paw Paw
NO!!!!!!! Zeros means no power.... I had the ignition at the WTS position..... The meter read zero!!!! I need a new glow plug relay..... Im not sure where you think I said that the relay is good....
More Turbo
Joined: Mar 2006
Posts: 582
Likes: 2
From: Eads, TN
I thought when he stated, "thanks though", I took it as something else. Glad we figured it out to be just the relay at this point, and "maybe" not the glow plugs at all.
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Senior User
Joined: Jun 2013
Posts: 392
Likes: 0
From: Paw Paw
Like I said the torque app is creditable but it only reads what it given not exactly a diagnostics scanner in real time readings.
Elder User
Joined: Sep 2011
Posts: 659
Likes: 1
From: Millstone, NJ
Glad you guys got it figured out.
The GPR is way overlooked when someone says there truck won't start when cold, must be the glow plugs...
Hopefully you will take my advise and upgrade to the Stancor GPR and do the GPR LED mod to make sure it is working.Welcome to guzzle's Stancor GPR replacement Mod Web Page
The GPR is way overlooked when someone says there truck won't start when cold, must be the glow plugs...
Hopefully you will take my advise and upgrade to the Stancor GPR and do the GPR LED mod to make sure it is working.Welcome to guzzle's Stancor GPR replacement Mod Web Page
Thread Starter
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Senior User
Joined: Jun 2013
Posts: 392
Likes: 0
From: Paw Paw
Glad you guys got it figured out.
The GPR is way overlooked when someone says there truck won't start when cold, must be the glow plugs...
Hopefully you will take my advise and upgrade to the Stancor GPR and do the GPR LED mod to make sure it is working.Welcome to guzzle's Stancor GPR replacement Mod Web Page
The GPR is way overlooked when someone says there truck won't start when cold, must be the glow plugs...
Hopefully you will take my advise and upgrade to the Stancor GPR and do the GPR LED mod to make sure it is working.Welcome to guzzle's Stancor GPR replacement Mod Web Page
Im definitely thinking about installing that LED Mod.
Elder User
Joined: Sep 2011
Posts: 659
Likes: 1
From: Millstone, NJ
You can buy the OEM relay from Riffraff, or probably local dealership. The LED mod will save your butt in the winter if your truck isn't starting, or just rule out that the GPR is not the problem.
Here is where I bought my Stancor GPR, which is on the website I sent you. 586 105111 White-Rodgers | Mouser
Fleet Mechanic
Joined: Nov 2010
Posts: 1,408
Likes: 249
From: Ringgold, Ga
Dylan go ahead and grab a 12v led at Radio Shack. About $3, use any small wire laying around.
Crimp a connector spade big enough to contact large post without rubber cover. Run into the cab. I just grounded my led right under the steering wheel on the dash frame.
My led just lays on my brake controller until ready to mount with guage pod someday.
Perfect time to do it while your swapping relay's. The GPR109 should be $25 at napa. When the stancor comes you will have a backup to help someone with.
Glad it was relay and not plugs.
Crimp a connector spade big enough to contact large post without rubber cover. Run into the cab. I just grounded my led right under the steering wheel on the dash frame.
My led just lays on my brake controller until ready to mount with guage pod someday.
Perfect time to do it while your swapping relay's. The GPR109 should be $25 at napa. When the stancor comes you will have a backup to help someone with.
Glad it was relay and not plugs.