Hi Milhouse,
I watched your video a few times, and have some questions and answers.
You showed a cable end with black, red, yellow and blue wires extending from the insulation. They should be taped back, insulated, and not allowed to touch. I'll have to look thru my notes to see what they are for. Horn? Lights? can't remember.
I could not see where the red and black wires from the battery are connected to the MP wiring. Are they actually connected somewhere?
Your video showed a cut cable end, but it was blurry and I couldn't make out wire size or color. Where does that cable come from?
Your English is fine. I like your smiley face. Here is mine.
TTFN,
Dennis