GMC Repair: no lt or rgt brake light, rear turn& hazards, gmc yukon, rgt

Question
Hi,                                                           Checked fuses,relays. Changed stoplight switch & bulbs.  Turn signals& hazards only work in front. Third brake light only one working.Back up lights still work. Will a faulty turn signal/combination switch still be the cause. 98' GMC Yukon 5.7  350

Answer
Hi
Yes the multi function switch MAY be your problem.
Make sure your getting hot on the white wire into switch(Terminal A-1)and NOT getting hot on the yellow  and/or DK. Green circuits (Term. E-6 and E-7) of the switch connector.
If this checks the switch.
IF it checks good, follow post back and we'll check farther down the line.
Hope this helps.
Good luck
Pawl