Have you tried using a fuse with a higher rating?
Although you shouldn't have to use anything higher than the
recommended, unless you have a large aftermarket stereo system or a
wire is grounding out somehow.
I had my right tail, right sidelight going for a couple of weeks before I
finally had the central locking/alarm go last week - it was the wiring loom
next to the boot hinge, most of the wires had broken (opening and closing
the boot over the years causes the wires to crack, and eventually the
insulation to split) and it was shorting out. Try looking there first.
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