UPDATE: Below is response I received from ATOPLITE when I requested return on Amazon - seems to be saying black wire not required. Nevertheless, DRL's not working.
Hi,bro. TKS for your feedback. now i'll give your an explanation .
negative (black) wire on the T10 plug is connected to the H4 plug pin (black wire）. Daylight and HI/LO beam have the negative ploe in common. at first, we leave the positive and negative both on the white T10 plug, but some users plug in the T10 at a reverse way ,H4 of HI/LO beam plug in at the same time.think about it , cause short curcuit . The fuse of the bike would pop.
LED light source is diffent from halogen light, halogen light is Independent. no poles respectively.
By the way, DRL can't light Independently. it light up with low beam when you start your bike. it's computer rule.We need to fit in with this .so No fault code is reported.
this light have a great performance. hope you enjoy your riding with it. lighting your way... if any issue, just follow us ins: atoplite . i'll send you some test video and pictures. tks for your support!