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post #1 of 28 Old 02-24-2012, 03:52 AM Thread Starter
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glow plug relay

Hello all new here! I am pretty mechanical but when it comes to deisel diagnosting I am lost. I own a 96' F350 7.3 4x4 4 door. When I got the tuck it had a utility box on it and I was averaging 18 mpg. Over time i switched the bed out for a regular bed. Now over time I am down to about 12 mpg now. I came to the conclusion that the map sensor was bad do to power loss. I replaced it and my power is back. I also replaced ebs tube. ( Now shifting better) I noticed the other day when I changed my fuel filter that the fuel heater is disconnected and obviously broke. Will this have anything to do with fuel milage? Also I know my glow plugs are not working, but I keep the truck plugged in when temps are below 55 degrees. Also was wondering if anyone has ever used starter solenoid to replace the glowplug relay. Seems like same set up and 15 bucks cheaper. Any suggestions or help would be appriciated.

Thanks Dave
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post #2 of 28 Old 02-24-2012, 06:22 AM
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It will work but it wont last, a starter solenoid is made to cycle for 15 sec or less and GP's cycle for up to 2 minutes, the starter one probably wouldnt last a week. If you want just about the best GPR there is, get a stancor relay, it is heavy duty and can handle the demand of the glow plug system and lasts way longer than a standard GPR

586-902 Stancor General Purpose / Industrial Relays

Elmo/Shane

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Everything.
And its expensive.

471,000 Miles


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post #3 of 28 Old 02-24-2012, 07:18 AM
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as far as fuel bowl heater goes dont worry about it as far as glow plug relays go but either a replacement or one for a winch that is 100% duty cycle or a stancore

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post #4 of 28 Old 02-24-2012, 11:00 AM Thread Starter
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ok ty is there anything other than the relay on there that looks like the solenoid.
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post #5 of 28 Old 02-24-2012, 11:08 AM Thread Starter
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I saw in front of the fuel filter area. there is a harness with a square fuse looking thing any idea what that is.
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post #6 of 28 Old 02-24-2012, 12:42 PM
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The square thing is probably the Water-In-Fuel (WIF) switch which is a little solid-state device. On the starter relay for a GPR question: You need to make sure that whatever relay you try is NOT CASE-GROUNDED (it must be case-isolated like the factory ones), otherwise the glowplugs will not turn off. Go with the Stancor. If you need to go cheap, get a Sorensen MR99 from AutoZone or a GPR-109 from NAPA (and order them by the part number, not by application because they will try to sell you something else). Both will work, but don't count on them to last. Cheers!

1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.
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post #7 of 28 Old 02-24-2012, 12:55 PM
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i just put in a cat relay and i'm loving the fast starts now....

96' F250 Ext.cab lb 4x4
stock tires
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post #8 of 28 Old 02-24-2012, 01:42 PM Thread Starter
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Quote:
Originally Posted by Patrick Feeley View Post
The square thing is probably the Water-In-Fuel (WIF) switch which is a little solid-state device. On the starter relay for a GPR question: You need to make sure that whatever relay you try is NOT CASE-GROUNDED (it must be case-isolated like the factory ones), otherwise the glowplugs will not turn off. Go with the Stancor. If you need to go cheap, get a Sorensen MR99 from AutoZone or a GPR-109 from NAPA (and order them by the part number, not by application because they will try to sell you something else). Both will work, but don't count on them to last. Cheers!
this looks like a fuse one of those goofy breaker ones square with two wires going to it. it is black, not on glowplug relay, clear top on it. Sits lose up near the eps. no one seems to know what it is. I will have to take picture of it.
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post #9 of 28 Old 02-24-2012, 01:43 PM Thread Starter
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Quote:
Originally Posted by Hendricksbus View Post
i just put in a cat relay and i'm loving the fast starts now....
what is this cat relay?
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post #10 of 28 Old 02-24-2012, 01:53 PM Thread Starter
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ok here is a picture of this square thing I am talking about!

ok can't just insert. hmm ok
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