For SM003 SM007 SM002 harness we provide 3 wire 

1 wire is black with pin, is connect to battery negative

1 wire is red with fuse and pin，is connec to battery positive

1 wire is red only wire, is connect to ACC wire

For SM002S and SM002H harness

these 2 harness is design for Lead-acid battery motorcycle, if you are using lithium battery please contact us

1s wire is red with fuse is connect to  battery positive part

2nd wire is blue battery negative part

3th is yellow small wire ( no need connect, this is backup wire)

4th is red small wire for SM002H, it's coonect to horn wire, to make horn strobe function

For SM002D harness

Red wire with fuse connect with battery positive part

Black wire connect to negative part 

Small 3 wire

Red wire connect it to ACC wire.

Green wire is high beam wire connect to pass light positive wire

Black is horn strobe wire, connect to horn wire.