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Hacked up wiring harness

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Old 05-17-2018, 04:30 AM   #1  
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Hacked up wiring harness

I have been redoing a 79 long bed and repairing the wiring harness has been very challenging. I have been unable to locate these wires in any diagram that I have found. Can someone please tell me what these are for?

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Old 05-17-2018, 06:02 AM   #2  
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The four blue wires with the plug on the end are for the speakers and plug into the radio. Assuming the wires in your hand in the first image are for the heater switch then I'm not entirely sure what those remaining cut wires do.
They look like they go together so what happens when you connect them? Maybe your truck had a factory tape player in addition to the radio?
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Old 05-17-2018, 04:35 PM   #3  
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The wires in my left hand are the stereo power, ground, and speaker wires that have been added. There wasnt a heater control in the truck when I got it, is it possible the cut wires go it? Does anyone know the wire color or what the plug looks like going to heater control?
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Old 05-18-2018, 04:03 PM   #4  
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I'm still looking at my harness out of an 81, so I may come up with some answers. It appears that the 3 prong plug in the center of the first pic goes to the heater unit on the left side.
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Old 05-18-2018, 06:08 PM   #5  
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How many plugs go to the heater control on your 81?
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Old 05-19-2018, 09:14 AM   #6  
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I looked at the heater box itself. You have a 3 prong plug that goes into the left side of the heater box and above it there is a two prong connector that hooks up to the wiring harness. There also should be a Four prong plug from the harness that hooks to the blower speed switch. I'll have to pull my harness out of storage to get you some wiring colors. The switch should be have White/Black, Lavender/White, Lavender/Yellow, and Lavender/Black. from the harness. I took those colors from the 83 FSM, you can download it from up in the Stickies above in the Forum. It has a section on BODY Electrical and Troubleshooting that might get you some info on hookups.

Don't be surprised to find plugs that were not used. They were for the different options that you truck didn't have, but they use a generic wiring harness for all

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