What is going to break? The lights needs 12 volts and the battery is a 12 volt battery. What someone might have meant is you can't connect any wires to any battery by sticking them in between the battery's posts and cable clamps. That will seriously degrade those connections. You typically won't notice a problem right away but as moisture gets in there, the connections will deteriorate and cause problems later.
For your lights, the black ground wires can bolt to anything metal on the body or engine. Connect the two red wires together, but then we have to determine how much current they are going to draw. There's two ways to connect these lights. One is to run both red wires to a switch, and the other terminal on the switch goes to a tap in the fuse box. If each one of your lights draws 5 amps, for example, you need a switch that can handle 10 amps, plus a little extra for a safety margin, so you'd want a 12 or 15 amp switch. Something like that gets pretty expensive so that leads to the second method, and that's to use a relay, just like your horn and starter use. The switch can be very small and inexpensive. All it does is turn on the relay. The relay handles the high current for the lights.
Tell me how much current the lights draw and how you want to wire the circuit, then I'll draw a diagram and explain it.
Wednesday, August 27th, 2014 AT 10:12 PM