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Old 02-06-2005, 06:51 PM   #1
Fred T
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Engine wiring help

Bought a new harness for my 69 with HEI conversion from GMC Paul a while back. Instructions say to compare to the old harness and wire accordingly. Well, my old harness was hacked by the p.o., so the instructions are useless.

I have a yellow and purple with lugs together.
A blue with a spade and round boot.
A yellow and a pink wire that mate into a spade.
A pink wire with a spade.
A dark green with a pin receptacle that I assume is for the temp sensor.
Which wire goes where????
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Old 02-06-2005, 07:06 PM   #2
71meangreenc10
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Blue is for Oil Pressure sender, pink & yellow goes to HEI, green goes to temp sender,yellow and purple with ends go to the starter solenoid, I ll have to get back on the single pink...

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Old 02-06-2005, 07:08 PM   #3
jhow66
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The pink-yellow would be used if you still had points to connect to the + on coil.(single pink would not be used if you still had points)
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Old 02-06-2005, 07:15 PM   #4
71meangreenc10
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I just looked at my HEI harness and mine doesnt have the single pink wire, So there are different variations
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71 C10 283/3SPD Full Resto
71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599
70 C10 Suburban Former military GSA truck.
72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378
72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110
68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head
71 C30 Wrecker
71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck
68 GMC Long Stepside. They keep following me home
71 C20 Longhorn/Ole Yellor
69 C30 Former Motor Home, Flat Bed time
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Old 02-06-2005, 07:15 PM   #5
Fred T
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Thanks. Am I right in thinking that the solenoid I post is unused with HEI? I put a mini starter on a while back and think there is only one wire going to the solenoid.
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Old 02-06-2005, 07:21 PM   #6
71meangreenc10
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As long as you have the right voltage goin to the hei while crancking the motor you should be fine, remember to tape or cut the end goin to the sol post, it should still be live, you dont want a short..Cant answer about the post being used w/hei.....
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71 C10 283/3SPD Full Resto
71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599
70 C10 Suburban Former military GSA truck.
72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378
72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110
68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head
71 C30 Wrecker
71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck
68 GMC Long Stepside. They keep following me home
71 C20 Longhorn/Ole Yellor
69 C30 Former Motor Home, Flat Bed time
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Old 02-06-2005, 11:45 PM   #7
jhow66
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Yellow wire in the pink-yellow harness is hot only in the crank mode-pink is hot when switch is on. (yellow wire supplies straight 12 volts to coil when cranking in a points system). Just tape this harness up as it will not be used in HEI system.
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