Chevrolet Colorado Questions

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questions ran fuel treatment on every other tank for about a month. There is no light coming on .
I've run fuel cleaner thru it on a couple on tanks.
I know one is brake switch.
dealer has checked and wiring ok,dealer replaced encoder motor.4x4 problem still exists.
When you apply brake signal light on dash comes on, but one signal lite does not blink. When you do apply brake your can hear a click noise on the drive side.
GM dealer checked for shorts ,loose wires behind dash ,scanned for other problems and resets 4x4,button lights come on 2h 4h&4L,shift to 4h and go a few miles service 4x4 comes on,buttons go off.
I change the switch and fuses are good
When i push the 4wd hi button it just flashes and does not engage same if i use 4wd lo
I was wiring an aftermarket radio and when I plugged the harness into the radio it shorted out, I heard the fuse pop but before I could unplug the harness I heard something else pop now I'm getting the reduced power message and my truck will only run show
I have no power to the 4x4 selector switch thought it might be bad. So i re placed it no change. My research points to the tccm.
I have replaced the 4x4 selector switch no change. Never had any problems with the 4x4 then it just quit working.
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