My friend is trying to wire 4 lights to a single 12V battery. Is it possible to simply wire two together to 12 gauge or other and two on a separate run back to the battery? Is it more complicated than that?
I've never ran into anyone who said 'I wish I would have ran smaller wire' in a 12 volt environment. If the LED's are 50 watt halogen equivalent, then they are about 7 watts a piece. I'm assuming 50 watt LEDs, which would pull around 4-6 amps at 12volts. I would also run separate fuses to each 50 watt light in addition to switches.
At 12v you be around 16.67 amps. I bet they dont pull that much.
#12 will work especially if its drop cord type wire. But I over do everything #10 will be plenty good and you could add more lights and still be fine. Everything will wire up straight up. All + to + and - to - .You can get nice and do a terminal strip and keep everything nice and tight.