glow plug conversion 7.3
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Elder User
Joined: Jul 2012
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From: Adair, ok
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
Postmaster
Joined: Aug 2010
Posts: 2,554
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From: Northern Arizona
Did you notice this "stickie" thread at the top of this discussion forum?
https://www.ford-trucks.com/forums/9...le-system.html
This should answer just about any GP question you have. There are pics and lots of expert info.
https://www.ford-trucks.com/forums/9...le-system.html
This should answer just about any GP question you have. There are pics and lots of expert info.
Postmaster
Joined: Feb 2011
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well one point to consider is that one of the small posts on the controller is supposed to be grounded, so the fact that both posts are hot tells me that your ground to the control side of things is the problem here. correcting that ground would make the whole system work as intended.
Post Fiend
Joined: Nov 2005
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From: Charles Town, W bygod Va
well one point to consider is that one of the small posts on the controller is supposed to be grounded, so the fact that both posts are hot tells me that your ground to the control side of things is the problem here. correcting that ground would make the whole system work as intended.
A quick check... Key on ground the terminal with the white wire. Solenoid should click and you should get power to the second big terminal
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Joined: Mar 2007
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If you reread my post it will tell you its the small one on the front. Slow down and listen to poeple.
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Elder User
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From: Adair, ok
Can you please go back threw here?
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 do what with them? ).and the end of the zigzag piece. ( is this meant to be one sentence? )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). (They are at then end of the zig zag piece from what ive read?)
run a wire to your switch from that post (the white wire which is a ground correct?)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 (the white wire which is a ground correct?)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
Post Fiend
Joined: Nov 2005
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From: Charles Town, W bygod Va
When you turn the key on, it sends power to one of the small terminals. The power goes through the coil inside the relay. that is why you get a voltage reading on both terminals with the key on. When the controller grounds the relay, current flows and turns the relay on, connecting the 2 big terminals. If you ground the relay with a switch you eliminate the controller. It is possible your controller is ok and providing a ground and putting a switch on it wont work. Thats why I said to ground the white wire and see if the relay clicks. What color are the wires that hook to the small terminals on the relay?
Post Fiend
Joined: Nov 2005
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From: Charles Town, W bygod Va
The yellow is probably the ground side. To be suredisconnect it then check for power with the key on. You should have power on the terminal and not the yellow slwire. If so, then ground the terminal and see if the relay clicks and gives power to the other big terminal. Obviously, don't ground it for more than 10 sec or so or you will burn out the glow plugs.
New User
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my 1986 w/ 6.9 came with 6volt quick start system ,so the controller goes bad , and being poor not able to buy the controller,,,i took a glow plug down my parts guys and eyeballed a comparable 12v plug bought a set ,,,by-passed controller with wire nuts, and ran hot solinoid trigger wire to a old horn button mounted just above the parking brake release..........worked for over 15 years,,,,,,,thank you very much