glow plug conversion 7.3
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Elder User
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From: Adair, ok
glow plug conversion 7.3
Some poeple say you run a wire from the big terminal to the small but my understanding is i run a big gauge ( 10 gauge maybe? )from the hot small terminal to a switch in the cab to the other dead small terminal to complete the circuit when i push the button. Is this correct? I do not wish to fry something so i thought i would ask first. It is a 1989 model 7.3.
Postmaster
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to fully understand your question, it would help to have more of a clue what you're trying to do to it.
i suspect you're trying to bypass the controller and just use a large relay (like a starter solenoid) to control your GPs? if yes, most starter solenoids are grounded through their mounting, and turn on when power is applied to one of the small posts. to wire this up, i would connect a small wire to the battery side of the relay, run it through a fuse, up to your switch, and back down to the control terminal of the relay.
if i misunderstood your question, please clarify
i suspect you're trying to bypass the controller and just use a large relay (like a starter solenoid) to control your GPs? if yes, most starter solenoids are grounded through their mounting, and turn on when power is applied to one of the small posts. to wire this up, i would connect a small wire to the battery side of the relay, run it through a fuse, up to your switch, and back down to the control terminal of the relay.
if i misunderstood your question, please clarify
Fleet Mechanic
Joined: Jun 2009
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From: CT
If i remember correctly these trucks run 6 volt glow plugs. The small wire, and such is to reduce the voltage. The stock system on the 7.3 works perfectly. If its not, its either your glow plugs, harness ( mine is falling apart ), or the relay.
Fleet Mechanic
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From: CT
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Laughing Gas
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From: Port Orchard, WA
If you have the early system, which I don't think you do, then the button connects the large battery-side terminal to the small +12v terminal which is a purple wire.
If you have the later system, I *THINK* that it has a constant +12v on one of the small terminals, and the controller just grounds the other small terminal to open the relay. If you have a multimeter, check for voltage at both small terminals with the key off. If I am correct, one of them will read 12v. If that is a case, then run a wire from the OTHER terminal to the switch, then the second terminal of the switch just ground somewhere.
If you have the later system, I *THINK* that it has a constant +12v on one of the small terminals, and the controller just grounds the other small terminal to open the relay. If you have a multimeter, check for voltage at both small terminals with the key off. If I am correct, one of them will read 12v. If that is a case, then run a wire from the OTHER terminal to the switch, then the second terminal of the switch just ground somewhere.
Laughing Gas
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From: Port Orchard, WA
-Matt
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From: Adair, ok
This is under my air breather....
With the key off only one post has power. That a big one and it has 12.7 volts. Now with the key on 3 out of 4 have power. the big one has 12.7 and the two smaller post have power also. the only one that doesnt have power is the one with the metal attached to it all bent up into turns and is used as a ground.
With the key off only one post has power. That a big one and it has 12.7 volts. Now with the key on 3 out of 4 have power. the big one has 12.7 and the two smaller post have power also. the only one that doesnt have power is the one with the metal attached to it all bent up into turns and is used as a ground.
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Elder User
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From: Adair, ok
I guess noone gets what i am trying to do. I want a push button switch so i can control my glow plugs. I want to be the boss of them. They only fire when my finger tells them to. I will go take a pic of my controller. This is not a 6.9 on the fender job. I am needing to work on my 7.3 glow plug system. I have no glowplugs currently and havnt since i bought the truck ( a week ago )
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I just did this. take all wires coming from the controller which is what the relay is bolted to and remove them from the relay.and the end of the zigzag piece. there are 2 small wires. the one on the back side is power when the key is on. Leave it. remove other small wire (white).
run a wire to your switch from that post. Thats ground for the relay . hook it up to your switch. hook another wire to your switch and run it to ground. I used the cig lighter ground. ground is ground.
when you push the switch with the key on it will give ground to your relay and it will click and energize.
You can do the hot wire but I like to use ground because there is less chance if shorting than a hot wire hot wire and burning your truck down
run a wire to your switch from that post. Thats ground for the relay . hook it up to your switch. hook another wire to your switch and run it to ground. I used the cig lighter ground. ground is ground.
when you push the switch with the key on it will give ground to your relay and it will click and energize.
You can do the hot wire but I like to use ground because there is less chance if shorting than a hot wire hot wire and burning your truck down