DUI wiring
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Cargo Master
Joined: Oct 2010
Posts: 3,417
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DUI wiring
Hey all. I'm at work and trying to get this worked out in my head. I know the Davis unified ignition hei distributer "DUI" only needs one hot lead to run. I am running a relay with a fused hot right from the battery to power it. However I still want to trip the relay from the ignition switch. So if I am thinking correctly? I need a circuit that is hot in start and run to keep the relay tripped. Is there a circuit on the ignition switch that stays hot with both. Or do I need to run a hot in run from the switch, and a hot in start from the I terminal on the solenoid to my relay to keep it tripped. Maybe there is a better way that i havent thought of. Thanks in advance.
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
[quote=bigdaddys76;10534877]Curious as to why you dont just use the hot from the ignition switch that goes out to the coil? Why the relay?[/quote]
Cause it needs full 12v. Stock coil wire runs thru a resistor wire dropping voltage. It's either the relay or run a seperate 12V switched source.
Cause it needs full 12v. Stock coil wire runs thru a resistor wire dropping voltage. It's either the relay or run a seperate 12V switched source.
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Cargo Master
Joined: Oct 2010
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Likes: 32
Ok so the hot from the switch to the coil is always hot in start and run correct? I just want to make sure. If so I will use that to trip my relay.
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
In start position it bypasses the resistor wire and gives full 12V to start, in the run position, it goes thru the resistor wire lowering voltage.
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Cargo Master
Joined: Oct 2010
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Cool thanks. I will be using that wire. After I get it all in I'll remove the rest of the dura spark wiring.
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Elder User
Joined: Jul 2005
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Yes it will trip your relay, It ran your old coil. Run a 10/12 ga wire from the battery side of the starter relay, I put a in line fuse in there, to post 30 on your new relay, ground post #85, 10/12 ga wire from post #87 to your HEI clone, put your old pos coil wire on post #86. Now you have a clean 12 volts to the Hei and no new strain on your trucks wiring and the new relay will only need a trickle of power from the old coil wire to trip the new relay.
Junior User
Joined: Nov 2010
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There's an unused plug (on my '75) on the wiring harness that runs along the firewall in the engine compartment. It is right behind and above the right hand valve cover. I assume it is for the air conditioner that my truck does not have. That plug is hot with the ignition on, but I don't know about in the "start" position. I think some circuits are switched off in the "start" position, and this could be one. I used it to power (throught a relay) an add-on electric choke that one of the previous owners installed. It's a handy place to pick up power for a relay control circuit.
Paul
Paul
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Don't scrap that Duraspark wiring! If you're not going to keep it I'll take it off your hands. I do conversions to the Duraspark all the time.
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Cargo Master
Joined: Oct 2010
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Sorry I'm keeping it for a 390 I'm building up for my dads ****** rat rod. I already have the distributer so I need the harness and the box. I'm just converting my ignition in my highboy with a 460.
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