Simple electrical wire joining technique - GIF

[Toolmaker51]

The tapered spring inside the better wire nuts do make for a mechanically sound connection, but not where movement and vibrations of mobile applications are involved without care being taken to secure them from movement. As with any electrical connection each has their place and each type should not the considered for the wrong application.

And yet far better than pinched splice "taps".

I just finished stripping all the wiring and components from a 'used to be' 2 axle 5th wheel camper. Lots of wire nuts and non-shielded ring terminals. originally they'd be enclosed only weather resistant, NOT weather proof, or easy to trouble shoot.
BUT they were all incredibly tight, yet not sealed with tape, silicone, shrink tube. I suppose mainly in consideration of labor.

RE-wiring hampered until I found a satisfactory weathertight box to begin anew. Got a surplus diecast enclosure, deep hinged cover with a square sectioned O-ring against 'knife' edges. It'll fit up under the neck, almost perfect protection from being hit, lid hinged down as a loose part tray, loads of room for terminal strip, fuses, spares, circuit breakers, and standard liquid tight entries, such as grommets or conduit fittings. Problem with conduit fittings, not suited to wire gauge diameters and much larger penetrations to enclosure, but mechanical (NPT) seal.
Everything will be crimped and soldered non insulated terminals, adequate looms and lacing, with longest runs through the frame laying in conduit, NOT wrapped around. About the only exposed wire will be electric brakes.
No pinch locks. No wire nuts. No bare splices.