How To Wire Driving Lights Into High Beam

Date Posted:2 February 2022

Driving in poor weather conditions or after dark can be dangerous unless you take the right precautions, but it doesn't have to stop you from getting off-road. Powerful spotlights are an essential accessory that will make it much easier for you to navigate across all types of terrain in your 4x4, no matter the weather conditions. Wiring spotlights into high beam circuits is not a difficult task if you're well prepared and have all the necessary tools. With our guide, you can make sure that you tackle the job the right way and avoid making any rookie mistakes when starting to wire spotlights to high beam.

How to wire driving lights into high beam: a quick guide

For the purposes of this guide, we're going to assume that you have bought a kit without a wiring harness. If this is the case, you'll need to find a wiring diagram for spotlights to high beams that is suitable for your kit or create your own before you get started. You'll also need to purchase a 12-Volt relay along with all the wiring and fuses required. If that's not the case, you probably won't have to go anywhere near your fuse box as most wiring harnesses connect directly to the high beam bulb plug.

Handy hint: You'll need to locate the high beam fuse in your engine compartment fuse box and it's a good idea to do this before you get started. When you're figuring out how to wire spotlights into high beam, diagrams for fuse boxes come in very handy for this very reason. So make sure you get hold of one for your vehicle if you don't already have one.

Choose a location to mount your relay

Pick a spot that's as far away from heat and moisture sources as possible and easy to get to, but don't actually mount the relay at this point.

Wiring

  • First of all, disconnect the cable that is connected to the negative terminal of your vehicle's battery. Whether you are wiring spotlights into high beam circuits or performing any other electrical work on your vehicle, it's important to disconnect the negative terminal of the battery before you do anything else. If you disconnect the positive terminal first, you may cause an electrical short.
  • Connect a power wire (red) from the positive terminal of your battery to pin no. 30 on the relay. Connect another power wire from your spotlights to pin no. 87 on the relay. You should be able to route this around the side of the engine bay. You can also ground your spotlights to your vehicle at the same time, using a black ground wire.
  • You now need to replace the high beam fuse that you located earlier with your fuse tap. You then need to run a wire from the tap to pin no. 86 on your relay. If you've read any other guides on how to wire up spotlights, you may have noticed that they instruct you to drill a small hole in your fuse box at this point, through which to run the wire to pin no. 86. Whether you need to do this will depend on the make and model of your vehicle: with some fuse boxes it is not necessary.
  • You will also need to install your spotlight switch somewhere in this part of your circuit (the wire from your fuse tap to pin no.86) so that you can prevent them from turning on when you use your high beam on public roads. The switch itself can be located in any convenient place in your vehicle.
  • Now run a ground wire from pin no. 85 on your relay to the body of your vehicle. This can be any easy-to-reach place, as long as you ensure there is a good connection.
  • Finally, you can reconnect the cable that you disconnected from the negative terminal of your battery before you started.

Testing and troubleshooting

If you've read all the way through this guide on how to wire driving lights into high beam circuits and followed the instructions carefully, you should now be ready to test your spotlights and see if you have wired them up correctly. This is the simplest part of the whole procedure: just get in your vehicle, turn on the switch that you installed for your new spotlights then turn on your headlights and put them on full/high beam. If you wired everything correctly, your spotlights should also come on at this point. They should also go off when you turn off the switch in your cabin. If they don't come on at all or they come on but don't go off when you turn off the switch, it's time to start troubleshooting and find out what the problem is

Before you start searching for more guides on how to wire spotlights into high beam, diagrams for spotlight circuits or any other help you can find, we recommend you check everything you have done carefully. Start by checking all the ground connections as these are one of the most common sources of problems when wiring up spotlights to high beam circuits.

If all of your ground connections look okay and you have not affixed any of them to a part of the chassis where rust or paint may be preventing a good connection, the next thing to check is all the connections that you made to your relay. Whether you drew your own wiring diagram or you are using one that came with your kit, now would be a good time to get it out so you can make sure you haven't connected any wires to the wrong relay pins.

If you purchased your lights and lighting accessories/wiring from 4x4 Mods Australia and you need any further advice on how to wire spotlights to main beam circuits, or you are having trouble creating/finding a wiring driving lights to high beam diagram that you can follow, please feel free to contact us at any time. It will be our pleasure to help you fit your spotlights to your 4x4 vehicle in Australia.

For any other 4x4 accessories, feel free to browse our online store.


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