How are the relay pins wired for the KC driving lights and LED bar?

Per the diagram, pin 87 goes +12V to the driving light bulb, pin 86 gets +12V from the main beam bulb cable (trigger), pin 85 goes to 0V chassis ground, and pin 30 gets +12V from a fused battery feed.

What gauge wire is used from the battery?

The diagram specifies 8 gauge wire on both battery connections.

How are the lights grounded?

The LED light bar and both KC lamps are each shown grounded to 0V chassis ground.

Are switches included in this auxiliary light circuit?

Yes, two rocker switches are shown wired into the circuits between the fuse block/relay wiring and the lights.

Where does relay pin 30 get its power?

Pin 30 receives +12V from a fused battery feed, supplied through the fuse block fed by 8 gauge wire from the battery.

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KC Driving Lights & LED Light Bar Relay Wiring Diagram - Ford Bronco Aux Lights

Wiring diagram for driving lights and LED light bar with relays, fuse block, and battery

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Auxiliary lighting wiring diagram showing relays, fuse block, rocker switch, battery and LED light bar with red and blue wires.

AI caption May 2017 · Photo 879 of 942

This document is a hand-drawn/computer-drawn wiring diagram for adding auxiliary lighting — KC driving lights and an LED light bar — to a vehicle, uploaded to a 1991 Ford Bronco gallery. It shows two standard 4/5-pin automotive relays, one labeled "Driving Light / KC" and one labeled "LED BAR." Each relay's pins are labeled: pin 87 outputs +12V to the driving light bulb, pin 86 receives +12V from the main beam (high beam) bulb cable as the trigger, pin 85 goes to 0V chassis ground, and pin 30 receives +12V from a fused battery feed. Power comes from the battery via 8 gauge wire to a multi-position fuse block, which distributes fused feeds. Two rocker switches are shown in the circuits between the fuse block/relays and the lights. The LED light bar and both KC lamps are each grounded to 0V chassis ground. Wire routing is depicted with red (power) and blue lines. A reader can learn a typical relay-based auxiliary light wiring scheme: fused battery power to relay pin 30, high-beam trigger to pin 86, ground on 85, and lamp output on 87, with rocker switches for manual control.

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Frequently asked questions

How are the relay pins wired for the KC driving lights and LED bar?: Per the diagram, pin 87 goes +12V to the driving light bulb, pin 86 gets +12V from the main beam bulb cable (trigger), pin 85 goes to 0V chassis ground, and pin 30 gets +12V from a fused battery feed.
What gauge wire is used from the battery?: The diagram specifies 8 gauge wire on both battery connections.
How are the lights grounded?: The LED light bar and both KC lamps are each shown grounded to 0V chassis ground.
Are switches included in this auxiliary light circuit?: Yes, two rocker switches are shown wired into the circuits between the fuse block/relay wiring and the lights.
Where does relay pin 30 get its power?: Pin 30 receives +12V from a fused battery feed, supplied through the fuse block fed by 8 gauge wire from the battery.