In article ,
wrote:
On Tuesday, 22 October 2019 13:22:55 UTC+1, wrote:
BMW 7 Series 3 years old. Has tw lights in the boot. One under the
parcel shelf and one in the lid. No sign of water ingress. Very
strange. Any bright ideas out there (excuse the pun)

If it's blowing a fuse there's a short somewhere. No mystery about that.
You just gotta find it. And that's no fun. I'd start by removing the
lamps so there's zero load, then replacing the fuse with a resistor, and
monitoring the voltage on its output. Disconnecting bits where accessible
will show you when the short goes away.

It might even be one of lamps (bulbs)

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle