HEI Extra pigtail? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Solver · 01-28-2003, 11:25 PM

I recently picked up this HEI for my 72 350 but it has an extra wire pigtail shown in picture on left side. Can I use this HEI on our trucks and if so what is done with the extra wires (IE what do they do or what won't they do if not hooked up)?

Suicide-D · 01-28-2003, 11:31 PM

looks like the ESC distributor in my 84 Jimmy... Electronic Spark Control... I'm not sure if it is necessary or not.

*Piston* · 01-28-2003, 11:39 PM

Yep its for ESC and without the ESC module connected, the ignition will not fire. You can replace the ignition module with a regular 4 pin and just remove the ESC wiring.

You can also jumper 2 of the wires to bypass the ESC control but I dont remember which ones right off hand. I can look into it if you need me to.

Solver · 01-29-2003, 12:22 AM

Ok I tried switching the modules but that doesn't appear to work as the new 4 pin module has only 2 pins going to the esc area (1 large 1 small) and the original ESC module has 3 pins (all small) so they don't go into socket. Tried removing the whole pigtail (socket and wires ) for ESC but the other end goes down into the distributer housing and is mounted to clip or ring inside there.(RED ARROW) I dont think I can just pull wires out. Any Suggestions? I surely can't be the only one who has made this mistake of getting to new of a distributer. thanks again

01-28-2003, 11:25 PM	#1
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	HEI Extra pigtail? I recently picked up this HEI for my 72 350 but it has an extra wire pigtail shown in picture on left side. Can I use this HEI on our trucks and if so what is done with the extra wires (IE what do they do or what won't they do if not hooked up)? Attached Images __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

01-29-2003, 12:22 AM	#4
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Ok I tried switching the modules but that doesn't appear to work as the new 4 pin module has only 2 pins going to the esc area (1 large 1 small) and the original ESC module has 3 pins (all small) so they don't go into socket. Tried removing the whole pigtail (socket and wires ) for ESC but the other end goes down into the distributer housing and is mounted to clip or ring inside there.(RED ARROW) I dont think I can just pull wires out. Any Suggestions? I surely can't be the only one who has made this mistake of getting to new of a distributer. thanks again Attached Images __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

01-28-2003, 11:31 PM	#2
Suicide-D Registered User Join Date: Jan 2001 Location: Katy, TX...but the love of my life resides in Dublin,OH. Posts: 1,408	looks like the ESC distributor in my 84 Jimmy... Electronic Spark Control... I'm not sure if it is necessary or not.

01-28-2003, 11:39 PM	#3
Piston Account Suspended Join Date: Oct 2002 Location: Olathe, KS Posts: 2,301	Yep its for ESC and without the ESC module connected, the ignition will not fire. You can replace the ignition module with a regular 4 pin and just remove the ESC wiring. You can also jumper 2 of the wires to bypass the ESC control but I dont remember which ones right off hand. I can look into it if you need me to.



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