Taking on a new project in an area I know little about. Saw an ad for a fat tire ebike without battery for $200. Figured that was cheap enough that even if it was a mess, should still be worth it. Got it home and took a better look, and it is indeed a mess. Not only is the battery missing, but it's been hacked up pretty good. Everything inside the battery box is loose; in other words it's already a failed project. Looks like someone tried to swap in a non-stock motor controller already (looks like it might not even be for an ebike) with tons of unconnected wires, marrettes (!) and electrical tape. However, I still think I can make a go of it, it's a very simple bike, a Sondors fat tire ebike, just a single speed and a simple handlebar throttle controller, I think I can figure it out. I was hoping someone could point me to web resources that would help me. As in what is a GOOD ebike forum?
https://endless-sphere.com/sphere/ is a place I've come across. I picked up a 20" 350W hubmotor at a bike swap meet for cheap, and so far have acquired what should be a compatible controller from Banggood.som, but haven't built a battery yet. The connections seem to be reasonably standardized, because I scrapped a junk e-scooter and the motor and controller wiring looked identical. I was thinking of making a pusher trailer out of it, but it might just become a motorized lawn chair or something silly.
