I have a 1976 Evinrude Power Pilot control box that has only 3 wires coming out of it. This is on a 1976 Glastron T-156 with a 1976 70 HP Evinrude motor.
1 wire is black
1 wire is purple
1 wire is red
I assume the black is the ground but what are the purple and red wires for and where do...