Unfused IGN to HEI question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigcarguy · 07-04-2002, 06:50 PM

Is there already a wire going from the unfused IGN to the engine compartment? There's one on my truck so I just plugged it into the new HEI(I figured the previous owner had wired it up in anticipation of getting an HEI). When I crunk it up and drove it I noticed an extreme loss of power. THe engine just seems to have no power and it keeps backfiring and shutting off. I removed the distributor earlier today, so it might not be in the right position, but I was wondering if maybe that wire had something to do with it.

chevyman 68 C/10 · 07-04-2002, 07:50 PM

I always run a new one from the fuse panel, making sure it is hot on ignition and start. (maybe a overkill but i use a 10 gage wire) Never had any trouble at all.

RipMeyer · 07-04-2002, 08:01 PM

The old wire is prolly a resistor wire. You MUST get rid of it. The HEI requires 12 Volts at all times.

Complete instructions here.

Click here for HEI instructions

bigcarguy · 07-04-2002, 10:34 PM

Well I adjusted the timing and a few other things and the truck cranked right up and drove fine. I'm guessing that 10g wire from the unfused terminal was put on there in anticipation of getting an HEI, but the previous owner just never got around to finishing the job. Would the truck run if the wire was the resistor type cause the truck ran great after I messed with the timing.

Longhorn Man · 07-05-2002, 12:00 AM

If it is added from the last owner, it is probably not a resistor wire.
Yes it would run with a resister wire, just not to full potental.

bigcarguy · 07-05-2002, 08:12 AM

I'm not 100% sure the previous owner put it on. Would a resistor wire be 10g?

RipMeyer · 07-05-2002, 12:00 PM

Most likely not. You should be ok.

07-04-2002, 06:50 PM	#1
bigcarguy Finally a Bulldawg Join Date: Apr 2001 Location: Athens, Georgia Posts: 220	Unfused IGN to HEI question Is there already a wire going from the unfused IGN to the engine compartment? There's one on my truck so I just plugged it into the new HEI(I figured the previous owner had wired it up in anticipation of getting an HEI). When I crunk it up and drove it I noticed an extreme loss of power. THe engine just seems to have no power and it keeps backfiring and shutting off. I removed the distributor earlier today, so it might not be in the right position, but I was wondering if maybe that wire had something to do with it. __________________ Ah yes, the college life. School all morning, work all night, study when ya can. Uh...

07-04-2002, 07:50 PM	#2
chevyman 68 C/10 Registered User Join Date: Feb 2002 Location: Gilmer, Texas USA Posts: 313	I always run a new one from the fuse panel, making sure it is hot on ignition and start. (maybe a overkill but i use a 10 gage wire) Never had any trouble at all. __________________ 69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck.

07-04-2002, 08:01 PM	#3
RipMeyer Registered User Join Date: Oct 2001 Location: Southern New Mexico Posts: 649	The old wire is prolly a resistor wire. You MUST get rid of it. The HEI requires 12 Volts at all times. Complete instructions here. Click here for HEI instructions Last edited by RipMeyer; 07-04-2002 at 08:05 PM.

07-04-2002, 10:34 PM	#4
bigcarguy Finally a Bulldawg Join Date: Apr 2001 Location: Athens, Georgia Posts: 220	Well I adjusted the timing and a few other things and the truck cranked right up and drove fine. I'm guessing that 10g wire from the unfused terminal was put on there in anticipation of getting an HEI, but the previous owner just never got around to finishing the job. Would the truck run if the wire was the resistor type cause the truck ran great after I messed with the timing. __________________ Ah yes, the college life. School all morning, work all night, study when ya can. Uh...

07-05-2002, 08:12 AM	#6
bigcarguy Finally a Bulldawg Join Date: Apr 2001 Location: Athens, Georgia Posts: 220	I'm not 100% sure the previous owner put it on. Would a resistor wire be 10g? __________________ Ah yes, the college life. School all morning, work all night, study when ya can. Uh...

07-05-2002, 12:00 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	If it is added from the last owner, it is probably not a resistor wire. Yes it would run with a resister wire, just not to full potental.

07-05-2002, 12:00 PM	#7
RipMeyer Registered User Join Date: Oct 2001 Location: Southern New Mexico Posts: 649	Most likely not. You should be ok.



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