73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Scott91370 on September 18, 2020, 11:34:11 am
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I have an 85 Sierra Classic cab that is going on an 82 Sierra chassis/engine/trans. Everything was unhooked when I got it because there was no engine These wires come out of the fire wall then magically multiply and end in these 3 plugs which I have no idea were they go (Let's say 2, the white square 4 pin is transmission). None of the diagrams I have found show this.
(https://www.gmsquarebody.com/media/1.9130/full)
(https://www.gmsquarebody.com/media/2.9131/full)
(https://www.gmsquarebody.com/media/3.9132/full)
Then there is this plug that comes out of the firewall directly under the bulkhead connector. There is a large (vacuum) hose and the connector. This one I think may be the cruise control but I don't have anything to hook it to compare the connection. Not sure where it may have gone...
(https://www.gmsquarebody.com/attachments/4-jpg.161972/)
Thanks in advance!!
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I your second picture, the top one goes to your oil sensor just above the oil filter. Not sure off hand on the others.
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Similar plug but my diagram shows it is a 3 wire that goes there with pink/white, dark blue, light blue then the light blue goes to the choke heater once there is pressure. Which I have found and connected there. Of course it isn't running so I don't know if the gauges will work.
All this 'extra' wiring is quite confusing. I wish I could find a truck exactly like mine that hadn't been messed with so I could look under it and take TONS of pictures.
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Three wires but only two contacts inside. I believe, two of the wires in the original goes to one of the contacts and the other wire to the other contact. I have only found after market plugs with two wires. Have not been able to find a three wire/two contact plug.