Looks like an electrical earth wire to me. It earths the door to the main frame of the van. Looks like yours is broken. I'd get it replaced. You can't rely on the hinges or latches to provide adequate grounding (earth) to the van, so they add the wire to maintain the circuit. Robert.
-- Edited by thomas01 on Thursday 23rd of November 2017 07:58:27 PM
yes it is just that
it is may be used to stop static electricity when you open door
I myself would not worry with it and take it off all together
the only other reason to be there is if they use it for earth return for a light
on door then replace
cheers mark