2002 7.3 Glow Plug Relay Wiring Diagram
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Discussion Starter · #1 ·
On a 2002 7.3l, can someone tell me for sure how the small wires on the GPR are wired? I mean is one always to ground and the other sends a positive signal when the relay is on....or is it something else? I'm installing a remote starter and instead of using a timer for the "wait to start" signal, I'm going to use the relay wire itself. I just need to know if it's positive or negative, on which post or both, while the relay is turned on. I don't have someone to help me with a test light and turning the key on and I'm too old to turn the key and make it to the test light before it's off!
Thanks
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Discussion Starter · #3 ·
Thanks for the reply. My GPR only has 4 posts so the diagram is a little confusing for me. But I'm taking a signal right off the energized side of the relay for the wait to start signal so I think I have it figured out.
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Wait to start signal is not part of the glowplug relay. Glowplugs stay on for up to 2 minutes.
Looking at the diagram, you have terminals 2,3,6,&10. 2 is battery power constant. 3 is the ground wire controlled by the PCM. 6 is to the glowplugs. 10 is power from the ignition switch.
When you turn the key to 'on' there is 12v to 10 constant. The PCM determines if the glowplugs should be activated and for how long. It will then ground the wire from terminal 3 to complete the circuit & activate the relay. The wait to start light is activated by the PCM and will turn off even though the glowplugs may still be live.
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Wait to start signal is not part of the glowplug relay. Glowplugs stay on for up to 2 minutes.
Looking at the diagram, you have terminals 2,3,6,&10. 2 is battery power constant. 3 is the ground wire controlled by the PCM. 6 is to the glowplugs. 10 is power from the ignition switch.
When you turn the key to 'on' there is 12v to 10 constant. The PCM determines if the glowplugs should be activated and for how long. It will then ground the wire from terminal 3 to complete the circuit & activate the relay. The wait to start light is activated by the PCM and will turn off even though the glowplugs may still be live.
Yes, your description is correct. The WTS light goes off after roughly 20 seconds (depending on conditions) and the glow plugs can stay on for up to 2 minutes.:ford:
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Discussion Starter · #6 · (Edited)
You guys are pretty smart, thanks for the help. I'm looking for a negative wait to start input on my remote starter. Since it sounds like I can't do that, I think I can use the gpr signal instead and I can tie into terminal 3 for the remote starter if I put a diode to isolate from the positive signal that will come when the relay is energized..is that right?
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WTS indicator
Ok so i see you are doing the same thing i am with the WTS negative signal for the auto start. what you need to do is go under the instrument panel on the left side of the steering colum is a 40-pin connector...pin number 37 is a black wire with a pink tracer...it is the wire that goes up to the wait to start indicator. you can tap off that wire. i have not figured out if it is a positive or negative signal in tat wire...if it is positvie, which i belive it is you will need to put a relay to reverse the polarity...just hook up the relay as follows....terminal 87 hook to the wire to the auto start, terminal 30 to ground, terminal 85 to ground and 86 to the WTS circuit. that will make the wts light trigger the relay and reverse the polarity....this should get you where you want to be to finish up your install
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A good remote start should have a wait to start timer built in to it. You shouldn't have to mess with the WTS light circuit or GP circuit or anything else.
If you hook to the WTS light, it's energized when you turn the key on, then drops out when the PCM tells it to. If you use a relay on that signal to "reverse" it (the remote start wants a grounded contact?), then you'll have a "relay race" going on and may get signals when you don't want them.
Check your remote start system to see if it can do the timing itself. Like I said, they should have a time delay built in.
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I'm curious can you have the two small wires backwards it would still make contact if it got power and ground right? And in essence if your gpm was bad could you just hookup a ground in your interior on a switch and just bypass it if it was bad so you wouldn't have to buy a 300 part
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Source: https://www.thedieselstop.com/threads/glow-plug-relay-wiring.242394/
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