Rear Wiper
I have a MK3 fiesta but mine is a 1993, but i think all the principals are the same with the tailgate. I'm guessing your wiper is just not working. I had the same problem and done the same things, it turns out the wiper and bits are earthed through the hing pins in your tailgate. I took mine out and gave them a good clean and works perfect now you should try that. You can tap the pins out with a hamer and screwdriver or pin punch, just be carefull and make sure that you use the screwdriver to temporarily replace the pin as you clean them or you tailgate will drop and twist and completely f**k the other hinge.
Goodluck
Rob.M
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