2 Wire Homelink (not overhead consol)

[LesStallings]

I recently got a visor style homelink (rolling codes). It is just the "black box" with grey cover for the three buttons. It is typical for all Dodge cars that have Homelink in the visor and not in any sort of consol. The box has two wires only, since this unit does nothing but open garage doors. It is NOT part of an overhead consol.

Does anyone know which wire (orange or black) is the 12V positive wire? I would guess that the orange one is positive and the black negative but I read where one person said the black was positive...

I looked over the previous post on the forum and most deal with the consol that has Homelink along with all the digital readout stuff. Any help will be appreciated.