Converting a VRod to a bagger with a Roadglide fairing. How do I wire?

Rod has 2 connectors, one for each of hi and low beam. Wires on one are yellow and black, wires on the other are white and black.

The wiring harness for the Roadglide lights has 4 wires. One yellow. One black. Two whites.

What connects to what?

 

Look up a wiring diagram.
Lots of information needed to answer your question.
You should have 3 wires - sound like the other has a high - low- and 2 grounds. Put power to them and see 12v dc pretty straight forward then verify your switch which is high and low. There is probably a conversion harness for that.