With winter coming I decided to get my wipers working. I rewired my 65 GMC with Autowire Highway 15 Kit. I didn't understand the wiper part. The aftermarket parts book Shows 2 speed switch for the 65 Chevy, Well 65 gmc uses a 1 speed. Trying to figure it out & blowing fuses I figure it out. Facing the wiper there two tangs, one on the left is power, the right one is ground. The switch is only a grounding point.Good to go now.