If your high beam switch doesn't work but your low beam switch position still does then you can add a relay that will make your high beam come on when your low beam goes off.
You'll need a five pin relay that has a normally closed "87a" pin on it. Wire it up as follows:
Pin 85 - Ground
Pin 86 - Low beam wire (yellow)
Pin 30 - Switched and fused 12V power
Pin 87a - High beam wire (white)
If your high beam works but not the low:
Pin 85 - Ground
Pin 86 - High beam wire (white)
Pin 30 - Switch and fused 12V power
Pin 87a - Low beam wire (yellow)
