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There are a few problems that could be at play here.
Your tail light is not suppose to flash at all. Your rear directional lights should flash. You should have a tail light when you turn your key on. When you actuate the front or rear brake the same bulb in the tail light will light brighter as your brake light. The OEM tail light is a dual filament 1157 type bulb but don't replace it with a regular 1157 and get the original lamp from a dealer because it is built to withstand more vibration than a standard 1157 for cars.
On the rear left turn signal light you will have 2 wires. 1- dark green and 1- black wire.
On the rear right signal light you will have 2 wires. 1- brown and 1- black wire.
On the front left turn signal light you will have 3 wires. 1- dark green 1- blue with red tracer and 1- black wire.
On the front right turn signal light you will have 3 wires. 1- brown 1- blue with red tracer and 1- black wire.
Each front turn signals also has a running light that is power by that blue with red tracer wire. When you look at the bulbs in the front you will see 2 filaments. One is for the directional signal and on is for the running light.
Keep in mind this is for the OEM lights and wiring. If the bike has been modified it may be wired wrong.
Check your bulbs and socket to make sure they are not blown. Check your flasher located in the lower left hand area of your fairing.
Let us know if the bike has other than OEM directionals etc.
We will try to help you get it in order.
