gp on a push button???
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From: Phill Mo
gp on a push button???
ok i have seen some of you have put your gp's on a push button, was wondering if this bypass the gpr? and what the binifits of this are? i have a new gpr and it seams 2 be working but no gp, i have new gp just have not put them in waiting on injecter o rings so i can re do them while gp are out. thanks
Postmaster
Joined: Sep 2007
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From: Medford Oregon
You might have noticed when starting the truck the voltage gauge goes low then stays there until the GPR turns off, assuming you are standing still. If you are in a rush to go immediately and as the RPM's go up so does the alternator output. I don't know the exact point (alternator output voltage) it occurs (think it's around 14 volts) but the PCM will cycle the GPR to prevent burnout. In other words the volt meter gauge will bounce up and down a bit while driving.
This happened to me a couple weeks ago as I had to leave quickly. I had one display on the Scan Gauge that was monitoring battery voltage at the time.
Fleet Owner
Joined: Aug 2004
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From: AZ
Thanks Jim for explaining that, I was wondering what was going on even after new GPR and GP's. About six years ago I put the GP's on a toggle switch and I use it if I make some short trips where the oil doesn't get warmed up causing them to run again. I just flip them off if I make short trips.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Even on the older rigs you have to use a relay in the glow plug circuit.
6.9 and 7.3 IDI glow plugs draw about 192 amps when heating.(I have not calculated the Stroke glow plug current, but I bet it is close to that number)
It would take a heathy switch to handle that many amps, and the extra wire into and back out of the cab would have to be some big wire to avoid excessive voltage drop at the glow plugs.
6.9 and 7.3 IDI glow plugs draw about 192 amps when heating.(I have not calculated the Stroke glow plug current, but I bet it is close to that number)
It would take a heathy switch to handle that many amps, and the extra wire into and back out of the cab would have to be some big wire to avoid excessive voltage drop at the glow plugs.
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Joined: Feb 2009
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From: Western NC
I put my GP's on a momentary contact switch. I still use the GPR & just activate the GPR with the momentary contact switch.
I like it.
I like it.
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
That is how I have my IDI set up, has been for years.
When the engine is warm, glow plugs are not needed at all.
So they are saved for when I do need them.
However, manual glow plugs are not the thing to have if anyone else drives your truck.
Trying to get them to understand "Hold the glow plugs for 10 seconds" seems to be rocket science to a good many people.
When your truck comes back, either you will need to replace a starter or glow plugs. Either they did not hold the glow switch long enough and the starter took a hit with excessive cranking or they held them on to long and burned out the glow plugs.
When the engine is warm, glow plugs are not needed at all.
So they are saved for when I do need them.
However, manual glow plugs are not the thing to have if anyone else drives your truck.
Trying to get them to understand "Hold the glow plugs for 10 seconds" seems to be rocket science to a good many people.
When your truck comes back, either you will need to replace a starter or glow plugs. Either they did not hold the glow switch long enough and the starter took a hit with excessive cranking or they held them on to long and burned out the glow plugs.
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From: North East Ohio
This can't be good for the relay.
I immediatley switch my headlights on and HVAC fan on to drop voltage till the the PCM deactivates the gp's.
You can use a toggle switch to cut off the gp's, but when it's this cold, the motor needs all the help it can get, IMO, to get up to temps and get going.
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From: metairie, LA
However, manual glow plugs are not the thing to have if anyone else drives your truck.
Trying to get them to understand "Hold the glow plugs for 10 seconds" seems to be rocket science to a good many people.
When your truck comes back, either you will need to replace a starter or glow plugs. Either they did not hold the glow switch long enough and the starter took a hit with excessive cranking or they held them on to long and burned out the glow plugs.
on an old kubota tractor i usedto work on... nobody that drove it could grasp the concept of glow plugs. so i wired a relay to the GPR that would kill the power to the start lead of the ignition switch when the gp's were engauged
Fleet Owner
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From: AZ
Good one George, I never thought of that. The VW diesels we have driven for thirty years has a glow light sorta like that tractor and no matter how many times I told her to wait until it went out she wouldn't remember. If it was really cold out I would remind her on her way out the door and then she would remember. If I was on the other end of the road I would get a call, the car won't start. She doesn't know what a gas gauge is eighter!!
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From: Phill Mo
Good one George, I never thought of that. The VW diesels we have driven for thirty years has a glow light sorta like that tractor and no matter how many times I told her to wait until it went out she wouldn't remember. If it was really cold out I would remind her on her way out the door and then she would remember. If I was on the other end of the road I would get a call, the car won't start. She doesn't know what a gas gauge is eighter!!
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Joined: Sep 2009
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From: Socal desert
I read somewhere that Ford designed the glow plugs to stay on for awhile after starting to help burn the carbon off the plug. Carbon build-up makes the plug difficult to remove.
The on time is controlled by the PCM, based on sensor inputs.
Also, a Cali truck will throw hard codes if you bypass or manually try to control the GP system.
The on time is controlled by the PCM, based on sensor inputs.
Also, a Cali truck will throw hard codes if you bypass or manually try to control the GP system.