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07-14-2013, 03:35 PM
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#1 |
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Registered User
Join Date: Nov 2012
Location: Morris, ct
Posts: 54
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Red 12v wire?? Where does it go
1985 gmc k2500 4wd vinM 350ci
Alright driver side of firewall in engine bay there is a 20amp glass fuse. Coming off it is a red 14gauge wire. It's about 3 feet long. It seems like it goes into the cab. It has a constant 12v. Idk where it goes. Can't really find it on the wiring diagram and I'm a little confused with some abbreviations in the wiring diagram. For some reason I think it's 4wd related idk. Anyone got an idea? Posted via Mobile Device |
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07-14-2013, 05:40 PM
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#2 |
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Registered User
Join Date: Mar 2000
Location: Clute, TX.
Posts: 1,935
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Re: Red 12v wire?? Where does it go
Probably an add on for a stereo or something... GOT A PICTURE ????,
Posted via Mobile Device
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2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe |
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07-15-2013, 12:49 PM
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#3 |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Re: Red 12v wire?? Where does it go
ya thats probably for an amp, cb radio, snow plow, winch....could be anything but its def not factory
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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07-16-2013, 07:24 PM
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#4 |
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Registered User
Join Date: Nov 2012
Location: Morris, ct
Posts: 54
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Re: Red 12v wire?? Where does it go
It's factory wiring. If u look at the wiring diagram "cab interior page 2" u can locate it.
http://www.73-87chevytrucks.com/tech..._V8_engine.jpg I think it's above generator, then to the right of the generator on the same wire it says k/81 & k/85 only?? Posted via Mobile Device |
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07-17-2013, 12:19 AM
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#5 |
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Registered User
Join Date: Jul 2012
Location: United States
Posts: 268
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Re: Red 12v wire?? Where does it go
Our 86' has that and it's the +12V feed for the trailer wiring.
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86' C30 Dually Crew Cab Ranch truck, carb'd 454, TH400, towing a slant load 4 horse trailer. |
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07-18-2013, 10:40 PM
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#6 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Red 12v wire?? Where does it go
I've got one runs front to back red thick in the harness to the back hitch area
in my 79 jimmy,told it was for the trailer,prob gona put a lighter plug back there using it
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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07-19-2013, 07:57 AM
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#7 |
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Registered User
Join Date: May 2007
Location: New Hampshire
Posts: 349
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Re: Red 12v wire?? Where does it go
Camper or heavy duty trailer package:
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07-20-2013, 08:45 AM
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#8 |
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Registered User
Join Date: Nov 2012
Location: Morris, ct
Posts: 54
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Re: Red 12v wire?? Where does it go
Thanks everyone very helpful. The trailer hitch idea makes a lot of sence. My truck is a vin M(heavy duty)
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