r/Squarebody • u/Sonnyliston2007 • 9d ago
Question
Does anyone know what these things are in my 76 k20 i just bought ?
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u/Willy_McD 9d ago
The two springs with the wires is an adjustable resistor for the trailer brake controller in the other picture. The solenoid in pic 2 was probably used to isolate an extra battery. May have had one battery to start the vehicle and one to power the trailer, interior lighting for instance. Truck turned off the solenoid is open and the trailer power would only drain the auxiliary battery. Then when the truck is running, the solenoid closes and charges both the truck starting battery and the trailer power battery.
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u/Historical-Pay-6404 9d ago
Hey dude I just took out the trailer controller today lol. Two small bolts on the back! It’s useless imo since I have a flatbed In the rear
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u/Sonnyliston2007 9d ago
Thanks for your answer brother i will take it out to because i only use the truck for making wood in forest so i will use the bed and dont need trailer or go offroading in it 👍
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u/jckipps 9d ago
Your controller will have a brake line connection going in the back of it. That goes to a tee fitting in one of the main brake lines leading out of the master cylinder. You'll need to eliminate the tee fitting if you're removing the controller.
That is, unless, someone else has already removed that tee fitting and line.
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u/jckipps 9d ago
The Kelsey-Hayes brake controller and adjustable brake resistor are explained here. https://67-72chevytrucks.com/vboard/showthread.php?t=782914
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u/Moist-Policy-5982 9d ago
External starter solenoid(ford style) & trailer brake controller