3588587 and 72 Demon

working on a 1972 Dart swinger 340 special here in CT

My car a the relay bolted to the dash frame. If I just unplug it and don't use it, will the unplugged circuit still allow the car to start? Regarding the wiper motor. got the car with the motor and the dash in it. But I am changing the dash to auto meter gauges. I think I mixed something up. I need to go see if I bought a dash harness online for an Abody because the one that was in the car was trashed. I think the harness I bought has a 3 speed plug for the wipers. But I have a 2 speed original motor. Did some of the later (after 72) Abody cars come with 3 speed wiper motors. Maybe I should install a 3 speed motor and just plug in what I have? looking for some input to get this done easy? dash is on a bench out of the car now. Maybe I should look for a new harness with the 2 speed plug while I am able to get at it on the bench. Car is also an original a/c car which I will be hooking up and using an aftermarket up front system. Maybe I should check out Carlisle for a dash harness with the 2 speed wiper motor?