Adding Hazard Lights to a Motorcycle

There are a lot of older bikes that don’t come with hazard lights. However, it’s super easy to add them! Especially nice for parades or stopping on the side of the road (hopefully for a picture, not a breakdown).

There are just a few things you need:

  • A common electromechanical flasher. These are available at most auto supply stores. I used the regular electromechanical one b/c the load of the blinkers is enough to flash it. However, if you have LED blinkers, you will need a solid state flasher.
  • 2x Diodes. I know, not super specific, but just a common diode that can handle 12V will handle the amps of the blinkers. I got the diodes that my local radio shack had which were 1N4004’s. Any 1N400X series should work.
  • Some sort of switch. I used a regular push button switch, but you can use a toggle or anything you want.
  • A standard disclosure from me. These steps worked great for me, but I take no responsibility for anything that you do, whether you follow these instructions exactly or not.

You need to find a 12V source and run that to the first terminal on the switch. This is where you need to decide if you want to run the blinkers with the key on or off. I had a separate fused circuit coming off the battery that was switched on with the key for my fairing that I tapped into. Might have to do some Google searches or probing with a multimeter to find a source that will work. Then run a wire from the other terminal to the “X” post.

Next, you will be running a wire from the “L” post that will split into a pig tail. After you split the wire into a pig tale, you need to add the diodes. The diodes need to be wired with the white mark away from the flasher. This makes sure that when you’re using just one blinker, it doesn’t go back up through the circuit and activate the other blinker.

Then you need to identify which wires go to the blinkers. There are two ways to do this, either find a wiring diagram or take a multi-meter and start testing wires looking for voltage changes as the blinkers are going. I used posi-taps to tap into the wires.

Here are a few pictures showing my setup:

Here is an overview showing the flasher and the wiring. I ended up shoving the flasher down between the battery and coolant tank. The black wire is the 12V source coming in (I know, NOT standard coloring. I don’t recomend you do that). The purple wire is coming off the Load terminal and then splits into the white and brown wires. The two bumps in the heat shrink are the diodes.
Flasher Wiring

Using posi-taps to tap into the blinker lines. Posi-taps are WAY better than scotch locks!! you can take these off pretty easily and it doesn’t damage the wire as much as scotch locks do.

Blinker Hook Up

The middle button is the button that I have wired up. It’s such a small button that it could be put anywhere. A side cover would be perfect if you didn’t have a fairing.

Flasher Button

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