I'm not at all qualified in electronics but I would use an ordinary ohmmeter. Put one lead to a bare metal part of the bike and touch the other lead to each of the three prongs of the headlite. One of them should show zero resistance and that one should be ground.(I think!).
Harley-Davidson® LED Lamps are brighter and whiter in color and provide a superior light pattern over standard incandescent lamps. Compared to the yellow light of a traditional halogen bulb, the LED lamp produces a "Daylight Color Impression" that appears more natural to the user. Headlamps feature 2 horizontal "D" shaped lenses that focus light into a pool in front of the motorcycle, and separate high beam and low beam projector lenses that provide a focused beam of light in front.
4" LED Auxiliary Lamps feature 3 "D" shaped lenses that focus the light, and provide a matching appearance to the LED headlamps. The solid-state LEDs are designed for long life, and the shock- and vibration-resistant lamp assembly mounts into existing light housings. Installation is quick and easy, and the plug-in lamps connect to the factory headlamp wiring.
No external ballast or complicated wire harness is required. The LED lamps are DOT approved for use in all 50 states. This product is available in multiple variations.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.