go to Oriley and buy a 30 amp 4 pole relay. about 8 bucks on the shelf. Should have numbers 30,85, 86, and 87. 30 is a fused constant power supply. 87 is power out 12 volts. 87 goes to the solenoid. when activated 30 and 87 are like a single wire. 85 is ground that goes to NSS pin. 86 is what I call the trigger switch wire it comes from a temporary 12v power switch. the 86 is the lead wire for the coil in the relay, and the 85 is the ground. the NSS supplies the ground when in park or neutral. 85 and 86 makes the coil charge and closes the points and joins 30 and 87 together to put out 12 volts and start the car. you would probably run 86 from the ignition switch start. if you have a ford like a solenoid hook it to the s side small post. https://www.youtube.com/watch?v=46nlei-2e4k