I know this has been ask before but I could not find the answer. My 72 has 3 wires to the starter from the factory. What is the r terminal for? Does this go to the coil? I am using an msd box and was wondering if this wire will still be used? I know what the main solenoid stud and s terminal are for but was wondering about the r terminal. I also know about removing the resistor wire for the msd hook up. Someone please help.