Attaching mains adapter to the site cable at home to charge c/van battery the blue plug on the mains attachment lead will not go fully in to the site cable socket end it is too tight to push fully home.
No visual obstruction. It was fine in summer pushed fully in.
Many thanks

Bob uk, February 2018

All done striped the plugs and socket apart found terminals rusty,not bad nevertheless stopped connecting fully cleaned and Vaseline (Petroleum jelly)the terminals cotton wool buds useful for socket tubes now perfect. Push in
fully and pull apart as they should.

Bob uk, February 2018