Turn On: How To Install Switched Accessory Power To Your Motorcycle

The pins on the relay are numbered for you to connect in the following way: 86. the switched power source; 85. the chassis ground; 30. the positive lead on the 15-amp circuit I want to power; 87. to the accessory plug itself. (Some relays also have a terminal 87a which allows power to pass through the relay when the switched power was off and isn’t applicable, here.)