tep by step
-3pins plug for old hid. you can put it the old port for control the hi and low beam
- you can find the back cable form relay small box wiring to the ground connecter on the battery(-)
- and other one is (+) from relay swicth you can connect to battary power (+)
better way you must have the pin socket from the relay for easier to wiring it
hope you can install it all good luck