Is this the correct HEI plug? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72 longhorn BB · 10-10-2005, 02:53 PM

Hello, I replaces my old distributer with an HEI unit and then went to a bone yard for a donor harness. What I found was this:

a 2 into 1 harness.

Is this correct?

What are the 2 wires for?

Shouldn't I have 2 wires hooked to the HEI.

-Chuck

cableguy0 · 10-10-2005, 02:59 PM

one of the wires is for a tach the other is the power feed. you dont need the harness . just use a female spade connector on the power wire

72 longhorn BB · 10-10-2005, 03:07 PM

but but if I wanted to use an OE style connector, it would ssem that the tach wire should not be hooked into the power wire. on this harness it is. the orange wire is what actually makes the connection to the HEI terminal on teh dizzy, but the ponk power wire seems to hook ou to it too.

I looked on a few donor cars and found the same thing.

Yes, I know the two terminals on dizzy are for tach and power, but what does it mean if they are configured this way in a GM OE harness?

thanks

cableguy0 · 10-10-2005, 03:13 PM

im not sure why theres two wires there. i cant remember seeing them that way but probably just never payed attention. you could always remove the thinner wire and use just the one.

dwaite72lnghrn · 10-10-2005, 03:22 PM

Or you could use the thin wire for the electric choke. The heavy wire to switched 12v and a seperate wire for the tach.

10-10-2005, 02:53 PM	#1
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Is this the correct HEI plug? Hello, I replaces my old distributer with an HEI unit and then went to a bone yard for a donor harness. What I found was this: a 2 into 1 harness. Is this correct? What are the 2 wires for? Shouldn't I have 2 wires hooked to the HEI. -Chuck __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"

10-10-2005, 02:59 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	one of the wires is for a tach the other is the power feed. you dont need the harness . just use a female spade connector on the power wire __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-10-2005, 03:07 PM	#3
72 longhorn BB Registered User Join Date: Jan 2000 Location: Michigan Posts: 312	Thanks cableguy but but if I wanted to use an OE style connector, it would ssem that the tach wire should not be hooked into the power wire. on this harness it is. the orange wire is what actually makes the connection to the HEI terminal on teh dizzy, but the ponk power wire seems to hook ou to it too. I looked on a few donor cars and found the same thing. Yes, I know the two terminals on dizzy are for tach and power, but what does it mean if they are configured this way in a GM OE harness? thanks __________________ Chuck 1972 C-20 Longhorn 402 BB .030" over (409?), curved HEI, RV cam, quadrajet, dual 3" exhaust, TH 400 ported w/shift kit 1999 K1500 Suburban (old style) 5.7L Vortec 4L60E "No matter where you go, ........ there you are"

10-10-2005, 03:13 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	im not sure why theres two wires there. i cant remember seeing them that way but probably just never payed attention. you could always remove the thinner wire and use just the one. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-10-2005, 03:22 PM	#5
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Or you could use the thin wire for the electric choke. The heavy wire to switched 12v and a seperate wire for the tach. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne



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