Hijet (96) Blowing Headlight Fuse

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Hi there,

I have a 1996 993cc 1L Hijet Minibus (converted camper). The lights blow a fuse the second they're switched on, no matter the fuse limit. I have taken all of the trim and lights off, found no wire breaks or exposed wire, but I did find a puddle of mossy water (due to a small missing panel in the passenger footwell). I replaced the panel, sealed it, cleaned and dried all of the parts and put it back together with all working bulbs. It immediately blew the fuse again as soon as I switched the lights on to test.

Anybody got any ideas what I should try next? Or a trouble shoot I've missed?

Thanks,
Rosie