Before connecting, spray both connectors with WD40 (has negligible
effect on signals). Connect. Wipe off WD40 (on outside, of course). Wrap
tightly and neatly with self-amalgamating tape. Spray again with WD40.
Will last for ever.
Ian.

Ian,

Surely the WD40 should not be applied to the electrically connecting surfaces ?
Isn't oil an insulator ?
And I wouldn't be happy leaving self amalgamating exposed to the sun - overwrap
in plastic insulating tape as well with the outermost layer not wrapped under much
tension to stop the tape unwrapping itself when baking in the sun.

Nick