I would second Kingfishers advice - check your supply lead first has it got a cut/been driven over too many times/other?
Maybe even try a replacement before digging too deep in to the van electrics.
If the problem persists with a new mains lead, then following Ian_G's advice would seem sensible, as that narrows it down to either a problem internal to the van, or some equipment you have plugged in.
As mentioned, a short between neutral and earth can cause RCDs to trip, which can be a paint to trace.
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Now offering T4 services in the Fareham area
Replacement keys programmed / supplied / cut
Diesel 135 upgrade available
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Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.
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