You can locate the relays in locations where bigger wires can be hidden then use control wires to activate the switch. Running a small two conductor wire from a low amperage switch (2-5 amp) (smaller) to a relay for control opens up a lot. Put some of these under the hood.. Control them with small switches. Good prices for relays and sockets.. The switch red wire would go to pin 86 on the Relay. Switch black wire to ground. From the Battery +, connect a 30A inline fuse and then connect that to Relay Pin 87. Relay Pin 85 goes to ground. Relay Pin 30 would be used for Load, i.e. your light bar + or red wire. The light bar black goes to ground. Relay Pin 87a is unused.
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Wire your LED light to a relay. Use the headlight wire as the trigger for the relay to close. A 4 pin or 5 pin ISO relay can be used. Pin 30: + input power. You can use an orange accessory wire or, pull power from battery (if so, add in line fuse) Pin 87: +output power . This will be the positive power lead to your light bar. In this how-to video, I demonstrate how to wire a relay correctly every time. Relays have four pins with specific numbers that reference their functions. The.