Glow Plug Relay - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 12-24-2006, 08:33 AM Thread Starter
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Glow Plug Relay

I have a 96 powerstroke and the glow plug relay isn't closing.I don't have 12 volts to the coil when i should. Whats the path for the 12 volts.I know earlier models had a control module on the firewall,but doesnt seem to be the case here on a 96.
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post #2 of 10 Old 12-27-2006, 07:51 PM
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Glow Plug relay location

Quote:
Originally Posted by bobdel View Post
I have a 96 powerstroke and the glow plug relay isn't closing.I don't have 12 volts to the coil when i should. Whats the path for the 12 volts.I know earlier models had a control module on the firewall,but doesnt seem to be the case here on a 96.
the starter relay and the glow plug relay look exactly the same. just one cost 25 more dollars
the glow plug relay is to the left of the fuel filter housing, using a test light, have some one turn the key on, and the big bolt that isn't "always hot" should come on for about 10 seconds and then your test light will go out.
replace with new one and it will solve problem. been there, done that. mine didn't work for probably 1 year before i decided to do this very, very simple task.

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'97 F250 ext. cab 4x4. DIY intake, 3" DP, kitty gutted, TW chip, 4-15-09 Tranny rebuilt, FPR shim, tech forum exhaust brake, isspro EGT gauge(stealth mounted) 292,000 miles, Dana 60 kingpin conversion, (thank you pipelayer!)
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post #3 of 10 Old 12-28-2006, 02:05 AM Thread Starter
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glow plug relay

Already replaced the relay and thats not the problem.I don't get 12volts to the coil terminal to energize it.I put in a manual push button switch to turn it on and that works,but it's bugging me where the 12volts original path is from to energize the relay.
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post #4 of 10 Old 12-28-2006, 04:05 PM
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Re: 12 volt Path to GPR

I have a 95 and the diagram for it shows the +12 volts comes from the ignition switch through pin #35 in the 42 way connector. The pcm furnishes the ground through pin #13 of the 42 way connector. These are the coil connection of the GPR. The Power post of the GPR (power for the Glow Plugs) comes direct from the starter relay with a fuseable link in the circuit.

Hope this helps (this is on a 95 model)

Jim

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post #5 of 10 Old 01-21-2007, 08:14 AM
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Hey guys...newb to the forum...but great stuff..I am haveing a similar problem with my glow plug relay. Don't have power to the hot side of the GPR and saw the note about the fusable link. Can you give me a clue where the fuse is? Will this require a new wire all togehter or can just the fuse link be replaced?
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post #6 of 10 Old 01-24-2007, 05:35 PM
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Re: Fuseable Link

I'm not sure of the exact location but It should be in the wire from the starter solenoid to the glow Plug relay. If it is open you need to check to see if there is a ground in the circuit that caused it to open. They are there to protect the circuit, and something caused it to blow. I would think they make repair kits for them just make sure to get the proper size (Amp rating).

Jim

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post #7 of 10 Old 01-24-2007, 05:40 PM
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Quote:
Originally Posted by bobdel View Post
I have a 96 powerstroke and the glow plug relay isn't closing.I don't have 12 volts to the coil when i should. Whats the path for the 12 volts.I know earlier models had a control module on the firewall,but doesnt seem to be the case here on a 96.
i have a spare 96 glow plug relay. you can have it if you need to replace it.

if you see a light at the end of the tunnel, it's probably just a photon torpedo
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post #8 of 10 Old 01-25-2007, 12:35 PM
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have a 97 psd, both large terminals on the gpr are hot all the time thus killing my batteries, i have replaced the relay and still have the problem... any suggestions?
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post #9 of 10 Old 01-25-2007, 12:40 PM
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glow plug o time is controled by the pcm ,on all psd , black/orange wire should be battery voltage on all the time the other side should only have power when switch turned on cold ,usually brown and yellow wires , the small wires are both controlled by the pcm ,one should have power and the other give ground when you turn the switch ,on unless wiring problem ,pcm may be bad ,check all wiring first though,ive oly seen pcm problems just a few times

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post #10 of 10 Old 01-25-2007, 01:13 PM
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Quote:
Originally Posted by kvblax View Post
have a 97 psd, both large terminals on the gpr are hot all the time thus killing my batteries, i have replaced the relay and still have the problem... any suggestions?
disconnect your relay, then try starting your engine. sometimes mine will start cold even when i don't use the glow plugs............


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