Stevie RS Boy

Ive got a 05 plate focus coming in on tuesday, and has a couple of electrical issues, firstly the offside indicator doesnt work, was intermitent but now packed up, i put on a new switch but that didnt cure it, also the number plate lights dont work, theres power at the fuse but nothing at the bulbs and the multiplug in the boot, also someone has put a plastic bag over the fuse box in the passenger footwell, do these suffer from water leaks? or even crap fuse boxes?? Any help would be very much appricated. Thanks

GVK.

Can suffer water ingress into fusebox, remove the multiplugs and check for green terminals.