4 Wheel Drive/SUVs: 1991 GMC TURN SIGNAL COMBO SWITCH, turn signal flasher, fuse block

Question
I have a 1991 GMC F/S PU, my right blinker will not blinkin the back, but it will in the front. I was wondering what a Turn signal combo switch does? I have replaced the bulbs, checked the fuses, I even intalled a new brake switch previously my brake lights went out. I had to rewire my trailer light because it was rigged. I connected my tailer all was workimg. But I now my right turn signal doesnt work please help. I have been using my Chilton, But it does not show me a picture or tell even what this switch does.
         Thank you,
           Adriane  

Answer
Adriane,

It sounds like a broken wire, or bad contact.  Check and see if the right brake light works on the truck, or on the trailer.  When you wired the truck for the trailer, you may have pulled loose, or broken the wire to the tail light.  As far as the "Turn signal  combo switch" goes, I am not familiar with that term.  Another possibility, is the turn signal "flasher".  This is a unit that causes the light to flash when the turn signal is on.  It is usually located under the dash on the driver's side, and is a plug in unit.  On some vehicles, it is located on the fuse block.  It is an inexpensive item, and easily replaced.

Carl