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#1 |
Active Member
Join Date: Mar 2004
Location: Virginia
Posts: 169
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Question for those with 4spd Manual
I'm just about done putting in the new Painless wiring harness but am stumped by one wire I took out. What is the black single wire that connects on top of the transmission near where the back up lights connect? I can't figure it out.
Thanks. 71 CST
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71 Blazer CST 72 K20 Capt USAF |
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#2 |
Registered User
Join Date: Oct 2001
Location: Littleton, CO. USA
Posts: 260
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Wish I could help!! I just took apart a 72 1/2 ton Cheyenne Super that had a 4spd in it and there were 2 wires in the loom that went down to the tranny by the backup light switch. Only 1 was used and I didn't take the time to try and figure out the other one. Good Luck, Rob
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#3 |
Registered User
Join Date: Aug 2003
Location: West Central Louisiana
Posts: 82
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Is it possible it's a standard loom (equipment package doesn't matter), and the extra wire is for a neutral safety switch on an automatic equipped vehicle?
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'72 Blazer, 4WD, 350/4 spd. Affectionately known as "Da Beast" '04 Silverado (new daily driver) '00 Intrepid (wife's ride) It's a BLAZER dude! No options, no emblems, no a/c, no fancy shmancy. It's a BLAZER.... ![]() |
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#4 |
Active Member
Join Date: Mar 2004
Location: Virginia
Posts: 169
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No, it's definitely for something because it has its own plug. The only reason I even ask the question is because the plug is broken, and I'd have to figure a way to get it back together. But if I can't figure out what it's for, I'm hoping it isn't that important and I can go without. The new harness does not have a matching wire for it.
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71 Blazer CST 72 K20 Capt USAF |
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#5 |
Registered User
Join Date: Dec 1999
Location: Old Mission, MI, USA
Posts: 2,510
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That wire/switch is for the Transmission Controlled Spark (TCS) system. The switch grounds the wire when the tranny is in 3rd gear.
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Tim |
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