hei wiring - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TODDS 72 · 09-18-2003, 06:09 PM

hey guys need a little help,going from points to hei on my 250 i6,need to know what to run for wiring and from where.
thought i had a diagram saved but can't find it ,i know this has been on the boards before.
Thanks Todd

TODDS 72 · 09-18-2003, 10:41 PM

ttt......anybody?

Hotrodhenryj · 09-18-2003, 10:59 PM

All you need is a hot lead from the ignition to fire the HEI. Should be able to use the + lead from your stock coil.

Orion 762 · 09-18-2003, 11:58 PM

This attached image may help. I found it here a few days back.

A "key" feature is getting the "pink" 12 gage wire directly to your new distributor. You can also completely remove the "yellow wire" going to your starter solenoid (on the starter for my '71 Cheyenne).

I believe that others have had problems using the old "+" lead to your coil, because the these leads were intentionally made "resistive" to reduce voltage to the coil (to around 7 volts or so). The new HEI needs the full 12 volts.

Orion 762

oldtrucknut · 09-19-2003, 12:31 AM

Yes, Orion is right that the stock coil wire will not supply full power that the HEI needs. I ran a wire from the "ignition unfused" terminal on the fuse block to the distributer. It works fine.

TODDS 72 · 09-19-2003, 06:50 AM

thanks guys,that diagram was the one i was lookin for..

biglou55 · 09-19-2003, 08:55 AM

todd72 biglou55 right down the bottom of the hill from you in greenfield I have a set of instructions for hei conversion that i got off one of the boards it is quite detailed if you would like a copy call me at work 7751607 I have voice mail or at home 772-6660 ask for lou senior. I am glad to have another 67-72 historian < ha-ha> around.

TODDS 72 · 09-19-2003, 05:34 PM

hey lou,,,,i think we have met before you stopped at my shop and wanted to buy my truck from me,bout a year or more ago,if your the lou with the small egine repair.if not its nice to meet someone local.

OldSkool71 · 09-19-2003, 08:28 PM

biglou55 is it possible for you to fax a copy or mail a copy of the instuctions? Let me know I can PM you with the number or address.

biglou55 · 09-22-2003, 09:54 AM

todd72 that,s me with the repair biz. I thought your garage was in buckland or am I confusing you with someone else. oldskool 71 I will be glad to mail you a copy or fax one if i can use the fax at work. hale@gcc.mass.edu

09-18-2003, 06:09 PM	#1
TODDS 72 Not the nightly winner Join Date: Jul 2002 Location: CHARLEMONT MA.USA Posts: 763	hei wiring hey guys need a little help,going from points to hei on my 250 i6,need to know what to run for wiring and from where. thought i had a diagram saved but can't find it ,i know this has been on the boards before. Thanks Todd __________________ 72C10SWB BLUE 350/350 86K10LWB BLUE 5.7 700r4 7.5' fisher plow 93S10XCAB4X4 BLUE 4.3 4L60e 69gmc c10 v8 3 on the tree yellow 72k10 swb 350 3 on the tree green 86k15 swb5.0L 4spd brown

09-18-2003, 10:41 PM	#2
TODDS 72 Not the nightly winner Join Date: Jul 2002 Location: CHARLEMONT MA.USA Posts: 763	ttt......anybody? __________________ 72C10SWB BLUE 350/350 86K10LWB BLUE 5.7 700r4 7.5' fisher plow 93S10XCAB4X4 BLUE 4.3 4L60e 69gmc c10 v8 3 on the tree yellow 72k10 swb 350 3 on the tree green 86k15 swb5.0L 4spd brown

09-18-2003, 10:59 PM	#3
Hotrodhenryj Truck Farmer Join Date: Nov 2001 Location: Lake Havasu City, Arizona Posts: 1,192	All you need is a hot lead from the ignition to fire the HEI. Should be able to use the + lead from your stock coil. __________________ Arizona rust free sheetmetal

09-18-2003, 11:58 PM	#4
Orion 762 Registered User Join Date: Sep 2003 Location: Mississippi Posts: 36	This attached image may help. I found it here a few days back. A "key" feature is getting the "pink" 12 gage wire directly to your new distributor. You can also completely remove the "yellow wire" going to your starter solenoid (on the starter for my '71 Cheyenne). I believe that others have had problems using the old "+" lead to your coil, because the these leads were intentionally made "resistive" to reduce voltage to the coil (to around 7 volts or so). The new HEI needs the full 12 volts. Orion 762 Attached Images

09-19-2003, 12:31 AM	#5
oldtrucknut 67-72 truck surgeon Join Date: Jul 2003 Location: Indiana Posts: 155	Yes, Orion is right that the stock coil wire will not supply full power that the HEI needs. I ran a wire from the "ignition unfused" terminal on the fuse block to the distributer. It works fine. __________________ 1969 Chevy C10 1993 Toyota Camry LE 1999 Ford F250 Super Duty 4x4 diesel 2008 Dodge Charger Super Bee 1953 International R182

09-19-2003, 06:50 AM	#6
TODDS 72 Not the nightly winner Join Date: Jul 2002 Location: CHARLEMONT MA.USA Posts: 763	thanks guys,that diagram was the one i was lookin for.. __________________ 72C10SWB BLUE 350/350 86K10LWB BLUE 5.7 700r4 7.5' fisher plow 93S10XCAB4X4 BLUE 4.3 4L60e 69gmc c10 v8 3 on the tree yellow 72k10 swb 350 3 on the tree green 86k15 swb5.0L 4spd brown

09-19-2003, 08:55 AM	#7
biglou55 Senior Member Join Date: Sep 2002 Location: Greenfield Mass. Posts: 551	todd72 biglou55 right down the bottom of the hill from you in greenfield I have a set of instructions for hei conversion that i got off one of the boards it is quite detailed if you would like a copy call me at work 7751607 I have voice mail or at home 772-6660 ask for lou senior. I am glad to have another 67-72 historian < ha-ha> around. __________________ Certifiably crazy person

09-19-2003, 05:34 PM	#8
TODDS 72 Not the nightly winner Join Date: Jul 2002 Location: CHARLEMONT MA.USA Posts: 763	hey lou,,,,i think we have met before you stopped at my shop and wanted to buy my truck from me,bout a year or more ago,if your the lou with the small egine repair.if not its nice to meet someone local. __________________ 72C10SWB BLUE 350/350 86K10LWB BLUE 5.7 700r4 7.5' fisher plow 93S10XCAB4X4 BLUE 4.3 4L60e 69gmc c10 v8 3 on the tree yellow 72k10 swb 350 3 on the tree green 86k15 swb5.0L 4spd brown

09-19-2003, 08:28 PM	#9
OldSkool71 C/10 CLUB MEMBER Join Date: Jul 2003 Location: Lakewood, CA Posts: 993	biglou55 is it possible for you to fax a copy or mail a copy of the instuctions? Let me know I can PM you with the number or address. __________________ -Ron-

09-22-2003, 09:54 AM	#10
biglou55 Senior Member Join Date: Sep 2002 Location: Greenfield Mass. Posts: 551	todd72 that,s me with the repair biz. I thought your garage was in buckland or am I confusing you with someone else. oldskool 71 I will be glad to mail you a copy or fax one if i can use the fax at work. hale@gcc.mass.edu __________________ Certifiably crazy person

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