Headlight dimmer switch wiring help!?

[07travis]

I've been in the process of rewiring my 72 to get it on the road again this summer but it seems like every time I look, I find another burned wire.... The current problem I am fixing is the headlight dimmer switch. As you can see by the picture, someone's replaced the switch before and did a real good job wiring it... They went so far as to tape it up with masking tape to make sure there wouldn't be any issues!!! What I need help with from you guys is what color wire goes to which post on the switch? I have a new switch and connector, but the connector only has black wires. The switch that was there is obviously wired, but I want to make sure that the right wire is going to the post before I wire it in. Any help is greatly appreciated!! Thanks!