You need to find out which brake system you have (Who made it) SMI, BLUE OX,M&G, etc. Then you will have to figure out which each of the pins in the 6 way plug do. 4 are basic 1 for parking /clearance lights, 1 for ground,1 for left turn/brake light, 1 for right turn/brake light. the other 2 pins on the 6 way plug 1 may be for the braking system, the other for a charge line to the toad battery while towing, or for something else. On mine it's to light a light on the dash when the toad brakes are on.