You switch the negative, not the posotive.
My friend came over to my house last night to show me his new car mod... I gave him my old neons that I had on my car before it was wrecked, 2 of them broke, and now he has the two that survived on there. Well he has no idea on how to wire anything at all apparently, even tho he claims to have wired his house!
He wired the lights to a house switch... and no only that instead of switching the negative... idk how to explain this, but he somehow hooked the positive and negative to the pattery to the switch, then also to the light... and the cable cought on fire... I told him he was a moron and then he tried to tell me that they worked before he put the switch on... of coarse! because he has no idea how a switch works lol. Anyway, shouldnt be that hard. I do this to one of my hard drives that has movies on it that I dont want someone to see so what I do is just unplug the power cable, and plug it in when i need it. Hasnt hurt it yet, and does the same thing as a switch basically only more work and works for hot swapping, just leave the ide cable plugged in or you could fry your ide channel.