Re: Wiring advice Nema 34 12 n.m motor, 8' wires?
I agree with 109jb. Trailer plugs operate in a pretty nasty dirty environment and they work pretty well. The terminals are pretty much self cleaning in that they scrape against each other when plugged & unplugged. If they are greased it does help with the water resistance, I like waterproof boat trailer wheel bearing grease for this.
If possible locate the plug in a somewhat protected area, maybe with a shield over it? RTV silicone and some shrink tube works well for sealing the wire side of both the plug and socket.
Jim Dawson
Sandy, Oregon, USA