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Old Feb 23, 2011 | 03:24 PM
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I apologize for this thread, but I'm getting a little anxious with the truck not running. Checked all the GP's last night and they were all working, but decided to replace the GPR as I was getting a lot of smoke on cold mornings. This morning it didnt start at all. Any help would be greatly appreciated.
 
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Old Feb 23, 2011 | 03:30 PM
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Originally Posted by tshrager
I apologize for this thread, but I'm getting a little anxious with the truck not running. Checked all the GP's last night and they were all working, but decided to replace the GPR as I was getting a lot of smoke on cold mornings. This morning it didnt start at all. Any help would be greatly appreciated.
How cold was it ?

How old are the batteries ? Were they fully charged?..
 
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Old Feb 23, 2011 | 03:32 PM
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How long did you let the glow plugs stay energized before you started cranking it?
You can also short the GPR out to make sure the GP's are energize.
 
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Old Feb 23, 2011 | 03:40 PM
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It was about 25-30 deg. Don't know about the batteries, I've had the truck about 6 months. I'm not hearing the block heater come on, but how do you "short" the GPR?
 
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Old Feb 23, 2011 | 03:46 PM
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It should fire right up with the heater plugged in. You can Ohm it out and see if it is OK. It should Ohm out at about 15. You may need to clean/change the end. Get all that green chit off it. Scratch the prongs up with some sand paper.
 
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Old Feb 23, 2011 | 04:47 PM
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Originally Posted by tshrager
It was about 25-30 deg. Don't know about the batteries, I've had the truck about 6 months. I'm not hearing the block heater come on, but how do you "short" the GPR?
Clamp a jumper cable clamp on the two large terminals ....

If you have someone to help you , you can use a screw driver too ..
 
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Old Feb 23, 2011 | 05:17 PM
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Action4478, are you talking about shorting the GPR? I have just replaced it and what will this accomplish? You guys are the best for all the help!
 
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Old Feb 23, 2011 | 05:19 PM
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Originally Posted by tshrager
Action4478, are you talking about shorting the GPR? I have just replaced it and what will this accomplish? You guys are the best for all the help!
Yep . We have seen them bad out of the box ...It is a simple test ...
 
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Old Feb 23, 2011 | 05:22 PM
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24/7 technical help!
You could use this site as a selling point for these trucks!
CONGRATS!!! you have reached 25 posts! You should be able to add a signature (upper left in the blue bar "User CP". If you can't add it today...you will be able to add it tomorrow (after the mod "OK's" it).
 
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Old Feb 23, 2011 | 07:30 PM
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Thanks again guys. Just found a few things. As I went to replace the block heater plug, the ground wire was crumbling all the way to about 10in past the plug. I replaced all the bad wire and plug. We put a screw driver across the 2 main terminals of the GPR and had spark with key off, but no spark with the key on. Does this mean the GPR is bad or good. I can't believe how much knowledge ya'll have about these trucks. I'm trying to learn all I can!
 
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Old Feb 23, 2011 | 07:43 PM
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Originally Posted by tshrager
Thanks again guys. Just found a few things. As I went to replace the block heater plug, the ground wire was crumbling all the way to about 10in past the plug. I replaced all the bad wire and plug. We put a screw driver across the 2 main terminals of the GPR and had spark with key off, but no spark with the key on. Does this mean the GPR is bad or good. I can't believe how much knowledge ya'll have about these trucks. I'm trying to learn all I can!
You should have spark with the key on or off . THe gpr gets its power from the PCM sending ground to it ...Its case isolated ...

One post is always hot (12V) the circuit is complete when the unit is grounded . (hot both sides ) can be tested with a meter ...Should be at least battery voltage .. What happens when you jump the GPR ? ....
 
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Old Feb 23, 2011 | 08:08 PM
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With the key off, the test light will show power to the 12volt constant, large terminal on the left. With the key on, the test light will light up on both large terminals
 
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Old Feb 23, 2011 | 08:14 PM
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Originally Posted by tshrager
With the key off, the test light will show power to the 12volt constant, large terminal on the left. With the key on, the test light will light up on both large terminals
Yes , but if is burned inside (contacts ) ,It won't carry the load necessary to power up the GP's ...
 
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Old Feb 23, 2011 | 09:56 PM
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Inside the wires or GPR? I apologize for all the questions....first diesel
 
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Old Feb 24, 2011 | 08:27 AM
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Originally Posted by tshrager
Inside the wires or GPR? I apologize for all the questions....first diesel
The GPR can click ,& measure voltage on the posts, but if the internal contacts are burned , sometimes it won't carry the load ...
 
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