Question on NightSun strobes, for anyone who knows:

Speaking of amber strobes, my 12V NightSun/Lightman strobe arrived yesterday (as did my Optronics housings, subject of a later post). It mostly looks straightforward to hook up to the system I'm building, Except there's no indication of polarity on the supplied connectors. The instructions say nothing about this either, except just plug it in to your NightSun battery - which of course I don't have because I'm making a homebrew system. Anyone know which side is + and which side is - on these things? Or is it polarity protected so I don't have to worry about it?