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Joined: Nov 2007
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From: Long Island, NY
These links should help. The relay is on top of the motor toward the front of the passange side valve cover. https://www.ford-trucks.com/forums/4...ke-thread.html
http://andersonimprovements.com/hobbies/truck/glowplugsandrelay.html
http://andersonimprovements.com/hobbies/truck/glowplugsandrelay.html
Last edited by scatgo; Jan 17, 2008 at 02:31 AM.
Posting Guru
Joined: Nov 2007
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From: Long Island, NY
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Senior User
Joined: Jan 2003
Posts: 241
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From: Redding, Ca USA
This might be a stupid ?...but here it goes. When changing the GPR is it neccessary to disconnect the batteries? Also if I unplug the plugs that are on the side of the valve covers, I can test the glow plugs that way(w/out pulling the valve covers)? I can change the GPR myself....but not really sure I want to tackle the GP's.
Thanks
Thanks
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Fleet Mechanic
Joined: Aug 2007
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From: The boonies by Dallas OR
Originally Posted by ramrod7373
When changing the GPR is it neccessary to disconnect the batteries?
You can check the GPR by measuring the voltage across the relay right after you turn the key on. It should only be around .2V.
Also check to see if you have at least 11V going out of the relay. The side to the plugs is the one with 8 wires heading out.
Originally Posted by ramrod7373
Also if I unplug the plugs that are on the side of the valve covers, I can test the glow plugs that way(w/out pulling the valve covers)?
Also, measure the resistance back to the GPR from the mating connector to make sure that all the wires have continutiy back to the relay.
Originally Posted by ramrod7373
I can change the GPR myself....but not really sure I want to tackle the GP's.
Thanks
Thanks
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Senior User
Joined: Jan 2003
Posts: 241
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From: Redding, Ca USA
Well I took it to the shop and had them change the glow plugs, GPR, fuel pump and all fuel hoses. It was worth the money to have the shop do it because I probably would have just screwed it up!!