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Andy4639 · 03-22-2017, 10:31 AM

Simple. The brake light switch is a ground activation circuit.

I would disconnect the switch under the hood and see if the light goes out. If it does then the head lights are some how grounding through the brake switch wire.

If you have everything working other than this one issue take a look at the back side of the ignition switch. Then the fuse block. The brake switch light on the dash runs to the ignition switch then to the fuse block then out to the switch on the brakes. It maybe shorting in the ignition switch plastic connector (those are bad about melting) theen the fuse block. Per the drawing I posted.
Is the temp gauge acting funny it's right beside the brake switch on the ignition switch connector. It's a ground also.

http://67-72chevytrucks.com/vboard/s...185856&page=16

03-22-2017, 10:31 AM	#5
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: Brake warning lamp issue Simple. The brake light switch is a ground activation circuit. I would disconnect the switch under the hood and see if the light goes out. If it does then the head lights are some how grounding through the brake switch wire. If you have everything working other than this one issue take a look at the back side of the ignition switch. Then the fuse block. The brake switch light on the dash runs to the ignition switch then to the fuse block then out to the switch on the brakes. It maybe shorting in the ignition switch plastic connector (those are bad about melting) theen the fuse block. Per the drawing I posted. Is the temp gauge acting funny it's right beside the brake switch on the ignition switch connector. It's a ground also. http://67-72chevytrucks.com/vboard/s...185856&page=16 __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.