I just got rear taillights that was a blinkers, brake light and running light, I didn’t like how bright the running light was so I wired in a little led light strip. I have absolutely very little experience but I did all of it with no videos for help. It was all pretty obvious on my old 1995 magna. I just looked at what wires went to what and used these connectors
(200 Pcs) MCIGCIM 16-14 Gauge Spade Disconnect Wire Connectors, Fully Insulated Male Female Nylon Quick Crimp Terminals Wiring Spade https://www.amazon.com/dp/B07Z7LTNR5/ref=cm_sw_r_cp_api_glt_fabc_5JHE82QNG007VN630NPE?_encoding=UTF8&psc=1