Review on 🔌 5-Pack Waterproof Relay Harness - 40/30 AMP 12V DC, Heavy-Duty 12 AWG Tinned Copper Wires, 5-PIN SPDT Bosch Style Automotive Relay by Jason Flippen

Wires are color coded to match the numbers assigned to the relay. This is where the wires connect. Red - Power In (fused) #30 Black - Ground #85 White - Switch #86 Blue - Light #87 Yellow - Secondary Light #87a. If installing a lightbar, use only the blue wire and ignore it. yellow wire. If you are installing a pair of headlights (fog or high beam), use the blue wire for one headlight and the yellow wire for the second headlight. Hope that helps.