A bit of a change of pace: documented the absolute ratsnest that is the back of my car's electrics, to get the trailer connector working properly. Seems it's just a grounding issue. The old wire goes nowhere, and my bodge job to attempt to fix it wasn't good enough. Next up is crimping together the floating ground wire to the thick yellow one going to one of the ground screws. !elektronik https://social.umeahackerspace.se/attachment/371577