60 Impala, new windshield wiper motor
 

I have a 1960 chevy Impala with a new stile windshield wiper motor on it. The pervious owner put it on the car. I have a new 2 speed switch with three wire connectors and the old one had only one wire connector. I can find no wires under the dash to help me. I think they were cut out. Can this be wired up to stay on the safe side?
Anyone out ther in Siber Space got any insite to this problem?
Thanks Abby