This diagram is specific for the 68/69 Corvair models years. 

EXTERIOR LAMP WIRING

12 RED - BATT feed to light switch

20 DK GREEN - Bat feed from headlight switch fuse into bat terminal of headlight switch

14 LT BLUE - Headlight switch out to center pin of dimmer switch

18 TAN - Low Beam headlights

16 LT GREEN - High Beam headlights

20 BROWN - Parking, License plate and side marker lights

20 LT GREEN - Reverse lights

20 PURPLE - UNKNOWN