Almost forgot to mention...I have an existing factory starter relay in my power center, that has a black & red wire going into it(constant 12 volt & a negative) and also two large purples going into it. One of the purples used to go straight to the starter solenoid I think, and the other purple is labeled that it used to go to a transmission plug that had a bunch more wires on it. Should this relay be tied into the mysterious harness purple wire in question? Thanks, Gar