I need to install one in another location as under rear plastic mud guard which is factory position sucks for me as my new loom won't go that far. Now which side is what? One pole brass and one silver? Why?

Hey Paulie I just put a new one on my bike 87 FXSTC. The silver pole (aux) runs to my regulator, and the brass pole (bat) has 2 wires coming from the loom

Hope that helps mate, no idea why 1 is brass and the other steel.

 Cheers burnzi, just what I needed to know..now just gotta replace the oil pressure switch I broke and keep wiring..should be ready this week..yay sir.

Bat is the main feed in. Aux is output.

 Cheers..done and relocated.