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Old 04-14-2012, 05:47:11 PM   #1
chester 81
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need help with computer harness

I read a couple of threads on disconnecting the computer harness on a 1981. it sounds like it's pretty straight forward but i want to make sure. Hopefully this picture will help. The 2 connectors that are close to each other plugged into the computer. The connector by itself plugged into a harness that goes up into the dash over the steering column it seems. What is this for and do i need any of those wires in that harness.
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Old 04-14-2012, 07:14:48 PM   #2
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The above post may have needed a sarcasm font....

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Old 04-14-2012, 08:08:56 PM   #3
Leonards78LT
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Quote:
Originally Posted by chester 81
I read a couple of threads on disconnecting the computer harness on a 1981. it sounds like it's pretty straight forward but i want to make sure. Hopefully this picture will help. The 2 connectors that are close to each other plugged into the computer. The connector by itself plugged into a harness that goes up into the dash over the steering column it seems. What is this for and do i need any of those wires in that harness.


The connector by itself is the wiring for the torque converter lock up ( part of the brake switch), park neutral switch, check engine light, diagnostic connector link etc.
You can look at he diagram below to trace the wiring that is used by the ecu.

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Old 04-14-2012, 08:30:42 PM   #4
chester 81
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So i have to strip that harness and seperate the wires for the ecu and reconnect the other plug and related wires? I hope that wasn't a dumb question. It's just that wiring can be alittle intimidating for someone who has never done anything like this before. Thanks
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Old 04-14-2012, 08:35:28 PM   #5
Leonards78LT
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Quote:
Originally Posted by chester 81
So i have to strip that harness and seperate the wires for the ecu and reconnect the other plug and related wires? I hope that wasn't a dumb question. It's just that wiring can be alittle intimidating for someone who has never done anything like this before. Thanks

If you have the subharness that plugs into to it, you are good to go. You should not have to seperate anything.
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My toy since June 1983: 1978 Camaro Type LT: Iron block LS6, 2004R, 3.42 posi. Boulevard Bruiser, Hi-Way Cruiser
http://www.chevythunder.com/Camaro%2...gh%20view.jpg"

Wife's toy since April '78- 1973 Mustang Grande 351C 2V #'s match.
http://www.chevythunder.com/1973%20F...ang%201999.jpg

DD's
2001 Buick Century
2006 Silverado 1500 ext. cab 5.3L
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Old 04-14-2012, 09:30:27 PM   #6
chester 81
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I appreciate your help but something just doesn't make sense to me. I'm going to take better pictures of the connectors and the other ends under the dash and look at this harness better. Maybe with the info you gave me it will make more sense once i'm looking at it. Thanks again and i will put up better pictures tomorrow.
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Old 04-15-2012, 10:51:46 AM   #7
Leonards78LT
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Quote:
Originally Posted by chester 81
I appreciate your help but something just doesn't make sense to me. I'm going to take better pictures of the connectors and the other ends under the dash and look at this harness better. Maybe with the info you gave me it will make more sense once i'm looking at it. Thanks again and i will put up better pictures tomorrow.

Are you wanting to just pull the whole thing out and go retrofit to a non computer controlled carb?
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My toy since June 1983: 1978 Camaro Type LT: Iron block LS6, 2004R, 3.42 posi. Boulevard Bruiser, Hi-Way Cruiser
http://www.chevythunder.com/Camaro%2...gh%20view.jpg"

Wife's toy since April '78- 1973 Mustang Grande 351C 2V #'s match.
http://www.chevythunder.com/1973%20F...ang%201999.jpg

DD's
2001 Buick Century
2006 Silverado 1500 ext. cab 5.3L
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Old 04-15-2012, 08:06:10 PM   #8
chester 81
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Yes, I'm swapping the engine and getting rid of all the emissions. So i pulled that entire harness out to clean up under the hood. The thing I don't understand is why would they bundle a bunch of other wires with the computer harness and tape it all up. I didn't get a chance to look at it today
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