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There is a great site for all things 12v. Oddly enough it's called the12v.com! :D Edit to add, here's your diagram: https://www.the12volt.com/relays/relaydiagram25.html (Turn off your ad blocker or it won't load correctly.) 86 goes to your existing back up lights. 85 goes to ground some...

18 watts is only 1.5 amps @ 12v, times 2 is 3 amps, so it should be fine, but.... I wouldn't. I'd add a relay for three reasons: 1. Just to be sure I don't tax the old system. 2. It isolates the new lights and makes it less likely that your new lights will cause problems that will harm the...