Q&A for How to Install LED Lights on a Motorcycle

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What do I connect the white wire to?

Community Answer

It's best to connect it to a chassis, or something made of conductive metal.

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Question

I have red, white and black wires. What is the white wire?

Community Answer

It is the ground wire. You connect it to the chassis or something that's made of conductive metal.

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Question

Can I put a red underglow light under my motorcycle and only Uber the bike in Mesa Arizona?

Clg000fc

Community Answer

Red underglow is typically illegal in most states because red white and blue are colors for emergency vehicles. Check with your local laws first.

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Question

Why would I want to ground the negative to my bike frame?

Community Answer

This is because your bike frame is a big piece of steel and the negative wire would ground out better.

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Question

Why do my lights keep turning on/off when the bike doesn't even have the key in the ignition?

Vassily Knigge

Community Answer

This is because there is a wire still getting a connection to the battery when the breaker isn't working properly. Check your wire connections.

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Question

I have existing LED lights on my Daymak scooter. Can I wire them directly to the light switch?

Tyler Harlan

Community Answer

You should not add any additional lights to your headlight circuit. There is most likely a fuse that can handle only so many amps of draw from the battery between the light switch and the battery on your scooter. If you attach another set of lights to this light switch, you might draw more current than the fuse can handle. If that happens, then you will not have any lights on your scooter at all. You would be better off installing a cheap aftermarket switch somewhere discreet with an inline fuse to the LED lights.

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Question

Why do I lose the blue light when I turn the ignition on?

Snakey006550

Top Answerer

If you lose the blue light when turning the ignition on, it could be due to a weak battery, loose wiring, a bad ground connection, or a short circuit. Check the battery and connections first. If the battery is fine, inspect the wiring and grounding. If the issue persists, have a mechanic check it.

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Question

How do I determine which of the four black wires on my LED lights is the ground if only one has a broken white line?

Snakey006550

Top Answerer

The wire with the broken white line is likely the ground. To confirm, check the manual or use a multimeter to test continuity between that wire and the light's metal housing. You can also connect it to a ground and test the light. If you're unsure, consult the manufacturer or a professional.

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Question

How do I connect LED lights with a brake function, and where should I attach them?

Snakey006550

Top Answerer

Locate the brake light signal wire in your vehicle using a wiring diagram or a multimeter. Connect the LED's brake wire securely to this signal wire using connectors or solder. Test by pressing the brake pedal to make sure the lights work. If unsure, consult a professional.

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