How to Wire Auxiliary Lights to a Motorcycle

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Installing auxiliary lights on your motorcycle is a great DIY project. They add functionality and can improve the appearance of your bike. A variety of lights can be added to your bike for different tasks. You can supplement your existing low and high beams or add additional marker lights to improve safety.

It is recommended that you don't tap into your existing light's power source. Wiring the new lights directly to your bike's battery ensures that you don't overload a circuit.

Strip 3/8 inches of insulation off the black insulated wire.

Connect the black wire to the black ground wire coming out of the light with a butt connector. These work by inserting one wire into each end and compressing with pliers.

Run the black wire to a good grounding point. A common spot is under any bolt fastened to the motorcycle's frame. Loosen the bolt, slide the wire underneath and tighten it down.

Strip 3/8 inches of insulation off the red wire and connect to the red positive wire at the light with a butt connector.

Run the red wire to the light's switch. Cut the wire with wire cutters and strip off 3/8 inches of insulation.

Loosen the two terminals on the back of the switch. Wrap the red wire around one of the terminals and tighten it down.

Strip 3/8 inches of insulation off another section of red insulated wire. Wrap this wire around the other terminal on the switch and tighten it down.

Run the red wire to the motorcycle's battery and cut and strip the wire. Connect the red wire to the fuse holder's wire with a butt connector.

Loosen the positive red terminal on the battery. Slide the fuse holder's other wire under the terminal and tighten it down.

Insert a fuse into the fuse holder. The size of the fuse is determined by the requirements of the lights. Consult the owner's manual for more information.

Wrap all of the connections in electrical tape and secure the loose wires with cable ties.