Please find your main issue from the following and click the link.
1:Instructions
(1):Warranty policy
(2):These tools would be needed when install the light
(3):How to test the functions of the headlight before installation
(4):How to install the KT headlight assembly
(5):How to install the KT HID projector kit
(6):How to install the KT single light
(7):The difference of the HID Bulb Color
 
2:Relay Harness
(1):How to check the pins of the connector(high/low beam connector)
(2):How to check the pins of the connector
(3):How to change the fuse
(4):How to change the igniter
(5):How to connect high beam wire & low beam wire to the original connector

3:Angel eye
(1):One angel eye do not work
(2):Both side of angel eyes do not work
(3):How to change the angel eye
 
4:Optical fiber
(1):The optical fiber do not work
(2):One side of optical fiber(DRL) work but won't sync
(3):Both side of optical fiber(DRL) work but won't sync
 
5:Demon eye
(1):One side of the demon eye do not work
(2):Both side of the demon eyes do not work
(3):One side of the demon eye keep flicking
(4):Both side of the demon eyes keep flicking
(5):How to change the demon eye
 
6:HID bulb
(1):One side of the HID bulb do not work
(2):Both side of the HID bulb do not work
(3):The HID bulbs keep flicking（One side of both side)
(4):HID works,but only low beam,without high beam(both sides or one side)
(5):How to test the HID bulb
(6):How to replace a built-in HID bulb
(7):How to replace a external-in HID bulb
 
7:HID ballast
(1):How to test the HID ballast
(2):How to mount the HID ballast
 
8:Adjusting bolt
(1):How to adjust the low beam cut-off line(Single light)
(2):How to adjust the low beam cut-off line(Dual light)
(3):If there is a positional deviation of the projector,how to do
(4):The HID bulb hit the fork,how to do
 
9:LED strip light
(1):Part of the LED strip light do not work
(2):The whole LED strip light didn't work
(3):How to cut off the wire of LED strip light
 
10:On/off switch
(1):How to install handlbar low beam on/off switch
(2):How to add extra on/off switch to control the angel/demon eye
 
11:Other issues
(1):How to distinguish high/low beam
(2):How to clear the dust in the headlight
(3):How to clear the moisture inside the headlight housing
(4):How to make a hole of the back cover
(5):For Kawasaki ZX-10R connections
 
Remark:If you do not know how to make trouble shooting,please kindly take the video to show us how does the product work and how all the wires connect,it will be easy for us to resolve your issue.If the video is too large,please upload it to youtube and then send us the link.