That's a 12 volt switch with wire leads protected by female connectors. There's not much chance of accidentally shorting one. But if you're concerned, pull a fuse or disconnect a breaker as needed, or tape over the red wired connector, which, if the switch is configured the way I think it is, is the only hot lead.
It's situations like this where a multimeter is priceless. I have several, from my electrician Dad's old high end analog Simpson, digital and clamp types for current measurements, to cheap analog ones. The inexpensive "Radio Shack Specials" are small and handy, but not really a bargain; cheap small gauge test leads all too often break at the solder inside their connectors or handles, and they aren't reliable. When you have a problem while traveling, you need tools that work, so get good ones.
Joel