I disconnected the malfunction switch and ran the test that you suggested. Everything worked as you said which suggested that the malfunction switch was faulty. However, I carefully opened up the switch and saw no visible damage to any contacts. I re-assembled the switch and started testing for continuity between the apprpriate pins on the connector portion of the switch. I realized that the 4-way button had been activated and after de-activating it, the switch had continuity between the pins and when installed, the brake lights function normally.
But I still have no blinkers or 4-ways. I started looking for the flasher but could not find it. I did find a group of 5 wires that had been cut. The colors are red, wht, blu, blk, and lt blu. Could these wires be for the flasher and the flasher is missing? I just got the truck and it seems as if someone has removed some parts. There is also a connector that is coming out of the harness that has 5 round pins in it but is not hooked up to anything. The colors of the wires going into it are red, blu, grn, blk, wht. What could it go to?
Let's combine the problems from both paragraphs to see if things make sense. If the flasher unit was missing AND the flasher button was activated, would the brake lights not work? If so than it would seem like the problem with the brake lights has been resolved and now the only problem lies in the flasher unit possibly being missing.
Your info is helping, keep it coming!