How to determine which wires are your motorcycle's brake light, tail light, and turn signal wires
This article will show you how to easily determine the function of all the lighting wires in your tail section without electrical tools.
(1) Get access to the lighting wires in the rear end of your bike.
You may need to partially disassemble the rear cowling of your bike to find the wires, but usually you just need to remove the passenger seat and peek inside.
(2) Write down the colors of the wires coming out of each lamp.
Carefully note whether wires are striped with two colors (white with a black stripe is different from black with a white stripe).
Left turn signal:
Right turn signal:
License plate light:
*Your brake/tail light is CANBUS if it only has two wires. In such bikes, the tail light and brake light signals are contained within a single wire. If the product you are trying to install does not have special instructions for CANBUS bikes, please Contact Us for assistance.
(3) Determine "Ground"
One of the wires attached to each lamp is the "ground" wire (a.k.a. the "common" or "negative" wire). The ground wire is the same color for every lamp. Look at the list above. The color that is attached to every lamp is ground. Write "ground" next to the appropriate wire color above.
(4) Determine tail light positive
The license plate positive wire is the one that's not ground. This wire will be the same color as your tail light positive wire. Write "tail" next to the appropriate wire color above.
(5) Determine brake light and turn signal positive
You've already determined ground and tail wire colors in your 3-wire brake/tail light. The one remaining wire color is your brake light positive wire. Likewise, the one color other than ground in each of your turn signals is the positive turn signal wire.
Try this out while looking at the bike. If you still need help, please Contact Us for assistance.