Thank you all for your replies - a lot of good info. And YES, I do have a 12v marine battery on the tongue of my trailer. During my research, I was quite confused because it seemed like to me that the breakaway switch was supposed have it's own little battery box. So now I understand that this switch runs off my RV battery. And thanks for the tip about buying an extra switch. I can't believe someone would steal that! Hopefully this is correct protocol in replying to everyone, this is my first time on this forum. THANKS! The next thing I need to do is to test the switch. I read that with the wheels turning, pull the switch out and the brakes should lock. That makes me a bit nervous, is it safe to do this if I am towing the TT VERY slowly, to have someone pull the pin out? Or should I take it to a garage and have it put a lift for testing?