I'm sure I've recounted this tale before, but however:
My BIL was visiting from fifty-odd miles away and arrived complaining his wipers weren't working. After lunch we went and had a look. No handbook, but I found a fuse blown. Probably something like a 10A. Replaced it and it blew. Put an ammeter across it and found it was supplying something like 20A. Without any information, I didn't know what else it was supplying, so I put a 20A fuse in. Wipers and everything else seemed to be working fine, without any burning smells. Off he went with me advising him to get a garage to sort it.
A couple of weeks later he was blaming me for the partial short circuit in the heated driver's seat burning a hole in the seat, trouser and bum as he was driving down a dual carriageway at 70MPH. He couldn't stand up until he stopped!
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