Is wiring a HEI really that easy?
05-09-2009, 10:48 AM
#1
4th Gear Member
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Location: Houston, TX
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Is wiring a HEI really that easy?
I just picked up a HEI dizzy (Thanks Steve). I was looking up how to wire it in. From what i found all you do is pipe the wires the would have been for the coil to the coil on top of the new dizzy. + to +, - to -.
Then the other wire coming from below the cap dont do anything? I guess they are for EFI/computer junk?
Then the other wire coming from below the cap dont do anything? I guess they are for EFI/computer junk?
05-09-2009, 11:41 AM
#3
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Haha, ya the wire do plug to the top. Guess I missed that.
Ok so the stock wire is resisted to 8v. Can the stock wire be modifed to push 12v? Or what is the easiest way to get the full 12v? Also does it need a negative to battery or body or something?
Ok so the stock wire is resisted to 8v. Can the stock wire be modifed to push 12v? Or what is the easiest way to get the full 12v? Also does it need a negative to battery or body or something?
05-09-2009, 12:34 PM
#4
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If you are talking about a GM style HEI, there are 2 connections. One is for 12V input and is the only one that needs to be hooked up for the car to run. The other connection is a tachometer output.
To answer the question regarding 8V vs 12V, the HEI needs 12V and the stock wire can be bypassed.
To answer the question regarding 8V vs 12V, the HEI needs 12V and the stock wire can be bypassed.
05-09-2009, 12:34 PM
#5
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Ok, correction. 12V switched goes to the BATT terminal, tach (if any) hooks up to the TACH terminal, and I believe it grounds through the case.
You need to bypass the stock ignition resistor wire to get full 12V to the coil power lead. The restiro wire is the tick pink wire coming out of the back of the ignition switch. Either remove it and crimp a new 90* spade connector on the new wire, or simply use a splice terminal on the wire close to the switch and run a new line out to the coil.
You need to bypass the stock ignition resistor wire to get full 12V to the coil power lead. The restiro wire is the tick pink wire coming out of the back of the ignition switch. Either remove it and crimp a new 90* spade connector on the new wire, or simply use a splice terminal on the wire close to the switch and run a new line out to the coil.
05-09-2009, 10:59 PM
#6
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Or leave the resistor wire in place and put in a relay to switch 12V to the HEI.
Take the resistor wire to the coil on a relay. Run 12V through the normally open contacts on the relay to the 12V terminal (BATT) on the HEI.
Take the resistor wire to the coil on a relay. Run 12V through the normally open contacts on the relay to the 12V terminal (BATT) on the HEI.
05-10-2009, 08:01 AM
#8
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What makes is a resistance wire is that it is made from resistance wire. The whole wire need to be bypassed. PM Me and I can send you a wire diagram if you need one.
Last edited by 109jb; 05-10-2009 at 08:05 AM.
05-10-2009, 10:29 AM
#9
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That's an abnormally complicated way to setup a 12V feed for an ignition circuit, especially one that draws very little power. It also adds a possible fail point (the relay) into the circuit. Bypassing the resistor wire is a much more simple, foolproof way of sending 12V to the ignition.