On 22/10/2019 18:19, 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.


If one of the lights in in the boot lid there must be a connection at
the edge of the moving part of the boot to the main body of the car.
Usually wires running in some black corrugated trunking. As the
trunking, and the wires inside, are flexing every time the boot is
opened or closed this would be my first place to look for damaged
wiring. You may have two wires where the insulation has failed and are
shorting together.

See the Youtube video related to a boot lid wiring breakage

https://www.youtube.com/watch?v=o_iI37G9k48


--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk