Car is a 65 Malibu with I believe to be a one speed motor. I got a new wiring harness form M&H for the engine. The yellow wire that connects to the wiper motor has 12+v on it, even if the key is off. Is this correct. Is there some sore of ground strap for the wiper motor or is the switch the ground source? The reason I ask is the switch is not mounted yet, thus the motor wont run until I ground it at the firewall. Any help much appreciated.