I have a 2002 Chevy blazer 2 door auto 4.3 v6. I’m having electrical issues.
When I put it in reverse the reverse lights don’t come on.
The blinkers don’t work but the bulbs and fuses okay.
the brake and tail lights were staying on when the car was running and when I pressed the brake the brake lights do not get brighter.

ive read that it could be the multi function switch or maybe that the previous owner wired the trailer hitch harness wrong causing the issues.
Any help will be useful