Headlight - Taillight Wiring

[mgm60]

So I’m mapping out a hodgepodge of wiring on my 36 Roadster with a plan to rewire. The car had one of those cheap 7 wire turn signal switches which did not work so I removed it. When I rewire I plan to use a Yankee 960 four wire switch.
When I pulled the headlights to check the wiring I found this Frankenstein retro fit. Looks like the builder modified for LED bulbs and also added a second bulb for the turn signal. Also isn’t the rear light suppose to be a two wire connection? Looks like a third wire was added to support turn signal.
Any thoughts on what I’m looking at here?
Mark