Allstar Performance 30 Amp Relay w/Harness 76186. Relay Switch, 30 amps, 12V, Wiring Included, Universal, Kit. *#30 TERMINAL FROM 12V "+" POWER SUPPLY WHICH IS PROTECTED BY A CIRCUIT BREAKER OR FUSE RATED AT 30 AMPS. #85 TERMINAL CONNECT TO A GOOD CHASSIS GROUND. THIS MAY ALSO BE USED AS A SWITCH TO GROUND (I.E. FOR A HORN) WHEN TERMINAL #86 IS CONNECTED TO A CONSTANT FUSED POWER. #86 TERMINAL SWITCHED 12V "+" POWER FROM A TOGGLE SWITCH OR CONTROLLED SIDE OF IGNITION SWITCH. #87 TERMINAL CONNECT TO 12V "+" SIDE OF COMPONENT TO BE ACTIVATED BY SWITCH/RELAY. I.E. FUEL PUMP, COOLING FAN ETC. #87A NOT COMMONLY USED, THIS TERMINAL HAS POWER UNTIL RELAY IS ENERGIZED. FIVE LEAD HARNESS - 3 12GA & 2 18GA