GPR By-Pass
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Senior User
Joined: Oct 2003
Posts: 351
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From: Sullivan, IL USA
GPR By-Pass
Has anyone done this? Do you like it?
1994-1997 Power Stroke FAQ - Glow Plug Relay Bypass
1994-1997 Power Stroke FAQ - Glow Plug Relay Bypass
PREMIUM SPONSOR
Joined: Sep 2003
Posts: 2,630
Likes: 217
From: North East Ohio
The GPR has a lot of drain to it. Just having the GPR cut-out while cranking will save some juice, maybe starter and batts, too.
But if you find the truck cranks alot for whatever reason, then I'd want the plugs charginf while cranking to get it going.
I think I still have some of those harnesses made up that I was selling eons ago, if you're interested let me know.
But if you find the truck cranks alot for whatever reason, then I'd want the plugs charginf while cranking to get it going.
I think I still have some of those harnesses made up that I was selling eons ago, if you're interested let me know.
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'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
'96 7.3 F-350 Reg Cab 4x4 - bought new.
'04 6.0 E-350 custom 4x4
'08 6.4 F-550 Reg Cab 6 spd 4x4
'17 6.7 F-250 KR ccsb 4x4
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
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From: The boonies by Dallas OR
Why put the extra strain on the plugs, relay, batteries and alternator? They all will last longer if strained less.
Thread Starter
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Senior User
Joined: Oct 2003
Posts: 351
Likes: 1
From: Sullivan, IL USA
The GPR has a lot of drain to it. Just having the GPR cut-out while cranking will save some juice, maybe starter and batts, too.
But if you find the truck cranks alot for whatever reason, then I'd want the plugs charginf while cranking to get it going.
I think I still have some of those harnesses made up that I was selling eons ago, if you're interested let me know.
But if you find the truck cranks alot for whatever reason, then I'd want the plugs charginf while cranking to get it going.
I think I still have some of those harnesses made up that I was selling eons ago, if you're interested let me know.
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Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
why not get you some custom tuning and turn them off through the chip. when i got my TW it shuts off the GP's anytime the engine is warm. i haven't looked to see how hot the coolant has to be, but its probably around 115* like the IH deactivation kit is. i would do one of these 2 things before putting a switch on them or anything. i'm not sure what Jim did with them with the harnesses.. i will go look at that now. i would just go with the chip though. i didn't ask for the GP's to be off when the truck was warm. from what i understand Tony does this standard on all his chips
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Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
Well, Travis, I'm thinking after noticing how the wait to start light looks that PHP has it also.
But the GP's are on for a second I think. I didn't listen for the relays though, it was to loud and raining.
The switch will keep them off no matter what.
A short burst of electricity is just as bad or worse then firing them up.
Everything has to fire up and think. The GP relay comes on at start no matter what, its just part of the programming, so if it takes 3 seconds for the computer, and 1 second for the GP relay, that's 2 seconds the glow plugs are on. That 2 seconds could be more harmful then the 2 to 3 minutes. Some types of circuits don't like short bursts of electricity. Can damage them.
But the GP's are on for a second I think. I didn't listen for the relays though, it was to loud and raining.
The switch will keep them off no matter what.
A short burst of electricity is just as bad or worse then firing them up.
Everything has to fire up and think. The GP relay comes on at start no matter what, its just part of the programming, so if it takes 3 seconds for the computer, and 1 second for the GP relay, that's 2 seconds the glow plugs are on. That 2 seconds could be more harmful then the 2 to 3 minutes. Some types of circuits don't like short bursts of electricity. Can damage them.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
why not get you some custom tuning and turn them off through the chip. when i got my TW it shuts off the GP's anytime the engine is warm. i haven't looked to see how hot the coolant has to be, but its probably around 115* like the IH deactivation kit is. i would do one of these 2 things before putting a switch on them or anything. i'm not sure what Jim did with them with the harnesses.. i will go look at that now. i would just go with the chip though. i didn't ask for the GP's to be off when the truck was warm. from what i understand Tony does this standard on all his chips
Are you sure about this, I never have heard about this capability of the chips
. And I agree with William. If I have a chance I will test the GPR switch when my truck is warm, I have a switch and a Chip and I can see if the volmeter doesnt register the GPs when warm. 
Senior User
Joined: Feb 2009
Posts: 148
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From: Western NC
I've made my glow plugs manual. I had a problem & just converted them to a push button on the dash. I don't need the plugs to come on here in the summertime & this conversion sure saves me wear & tear.
Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
well i haven't tested it to see if the GP's don't come on at all. i just know that when i got the chip the battery guage never dropped at all when the engine was warm and i went to start it. it cranked MUCH MUCH faster as well!!!! LoL. like i said. no tests were run, but i could if i felt it was important. i don't even have my GPR plugged in right now though. hahaha
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
well i haven't tested it to see if the GP's don't come on at all. i just know that when i got the chip the battery guage never dropped at all when the engine was warm and i went to start it. it cranked MUCH MUCH faster as well!!!! LoL. like i said. no tests were run, but i could if i felt it was important. i don't even have my GPR plugged in right now though. hahaha
BTW William, thanks for the advice but I dont have a clamp on amp meter. so Im going to base my conclusions in the idiot battery gauge.
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
I know my batter gauge with the GPR on, and off isn't much different.
I know if i hit the key. i can hear the GRP relay kick.
And after about 2 mins I hear it kick off, but only if i'm standing in the engine bay.
It also sounds like my GPR relay kicks on and off while cranking.
I know if i hit the key. i can hear the GRP relay kick.
And after about 2 mins I hear it kick off, but only if i'm standing in the engine bay.
It also sounds like my GPR relay kicks on and off while cranking.