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How to Wire Your Off-Road Lights

Installing Off Road Lights that Turn On With Your High Beams

  • Make sure your alternator and electrical system have the bandwidth to power additional accessories. If you have doubts about sufficient power, determine the output amperage of your alternator and calculate the load (load is the total amperage of all your running electrical accessories. If only wattage is known, use the formula watts/volts=amps). Your ability to supply power shouldn't exceed your intended consumption.
  • Disconnect your battery then use the wiring diagram or a test light to find the wire connecting the high beam switch to your headlights. Remove the harness leading to your headlight housing and move your test light probe to each pin until power is found with the high beam switch turned to the on position. Purchasing a relay harness kit designed specifically for your headlight configuration makes life much easier. Using a relay will allow you to draw power directly from your battery and reduce strain on your factory wiring harness. This is not only safer, but light output is also improved.
  • Mount your lights in the chosen location but leave the final tightening until you’re completely finished wiring. Leaving the lights loose will make trouble shooting and manipulation far easier until you’re certain everything is working properly.
  • Mount the relay in the engine compartment close enough to the battery to neatly extend the necessary wires.
  • Aim your lights slightly above your low beams at a distance of 25 ft. and tighten the mounting hardware. Clean up the install by securing the new wires to the existing harness under the hood with wire ties.

How to Install Lights on a Stand Alone Rocker Switch

  • Disconnect the ground terminal on your battery.
  • Choose a mounting location and loosely mount your lights in case you need to make wiring adjustments.
  • Install your rocker switch in a convenient location. Pro Tip: Temporarily mount the switch and try it from the driving position before securing it permanently.
  • Connect the wire coming from under the dash to the switch terminal on the relay. Then, connect the battery terminal on the relay to the battery with an inline fuse large enough for the load.
  • Use another wire to connect from the ground terminal on the switch to a solid metal part under the dash to complete your ground connection.
  • Connect a third wire to the load side of the switch (typically the center lug) and feed it through the firewall into the engine compartment, leaving several feet of excess wire to be trimmed later.
  • Mount the relay in the engine compartment close enough to the battery to neatly extend the necessary wires.
  • Connect a wire, usually red, to the wires on the lights and to the solenoid terminal specified in your instructions. Double-check all connections before reconnecting the battery.
  • Connect the wire coming from under the dash to the switch terminal on the relay. Then, connect the battery terminal on the relay to the battery with an inline fuse large enough for the load.
  • Aim your lights slightly above your low beams at a distance of 25 ft. and tighten mounting hardware. Clean up the install by securing the new wires to the existing harness under the hood with wire ties.

Some Final Words of Wisdom

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