I have a little 12ft open dinghy which needs nav lights. The outboard is a 4hp Mariner/Mercury two stroke single pot from the 90s. Do I understand correctly that the outboard generates 12v AC? Can I tap off this, put it through a rectifier and draw 1 amp absolute maximum from it to power the lights without affecting the ignition system operation? Will a motor cycle type 12v rectifier do the job? Can I tap off anywhere on the engine I can find 12v AC? Thanks in advance.