Old style GP controller
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Freshman User
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Old style GP controller
How can i bypass the GP controller all together, having problems starting the GP relay is on a switch in dash. 1985 F250 6.9, replaced 4 glow plugs about a month ago with ZD1s. Couldnt get to other 4 which some of them wore swollen and i didnt want to push it getting them out.. I think its the controller thats bad. Also having a problem when warm starting it starts right up and idles fine for about 20 sec then it starts chugging. It will stall if i dont keep it running feathering the throttle?? Any ideas would be greatly apprietiated.
Lead Driver
Joined: Mar 2006
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From: western SD
https://www.ford-trucks.com/forums/9...old-style.html Have a look at this thread, Dave tells you how to do what you are asking. How long since the fuel filter was changed? Are you running any fuel additives?
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Freshman User
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so could i just unhook the controller? Whats properly wired.. i unhooked the purple wire on the relay and wired it to switch in dash.. switch in dash is one wire going to relay and one wire thats assc. hot? is that right it turns the glow plug light on and heats them up.. well used too.. Also i replaced the GP relay with a starter relay is there a problem with that??
Lead Driver
Joined: Mar 2006
Posts: 5,111
Likes: 1,549
From: western SD
so could i just unhook the controller? Whats properly wired.. i unhooked the purple wire on the relay and wired it to switch in dash.. switch in dash is one wire going to relay and one wire thats assc. hot? is that right it turns the glow plug light on and heats them up.. well used too.. Also i replaced the GP relay with a starter relay is there a problem with that??
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Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
^^^^ +1; Starter relay can't handle the current draw of the glow plugs, esp. for the amount of time they're energized.
As to the wiring, yeah, if the switch wire is going to the relay terminal that connects to the controller, you're effectively bypassing the controller. So it's out of the picture, and is probably not part of your starting problem. You could, just to be sure, try disconnecting that purple wire from the controller, but then you're completely dependent on your dash switch for the GPs.
But I'd start with a real relay capable of handling the load. A lot of guys use a Western Plow relay.
As to the wiring, yeah, if the switch wire is going to the relay terminal that connects to the controller, you're effectively bypassing the controller. So it's out of the picture, and is probably not part of your starting problem. You could, just to be sure, try disconnecting that purple wire from the controller, but then you're completely dependent on your dash switch for the GPs.
But I'd start with a real relay capable of handling the load. A lot of guys use a Western Plow relay.
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