The headlights on my 85 IROC stared to act up after driving about 45 minutes. They would blink and flash on their own. I tapped the side of the dash where the switch is and they would go out completly, just the headlights, another tap and they would come back on. I pulled the headlight swich and the wiring connector is fried. I ordered a new one (PT181) and bought a new headlight switch. The factory wiring harnass in the car has 7 wires, the new pigtail has only 5. From the numbers on the switch, pin 3 and the connector for the dimmer resistor seem to be the missing wires.
Has anyone ran into this? Did I get the wrong plug, or do you just delete the other wires?
Thanks!

 

Wow, dont everyone answer all at once.

It looks like both the headlight switch and pigtail are made to fit everything fron 68-89. This may explain the missing wires. I bought some GM terminal ends at the local parts store and will just make the other wires needed.