what did it do when you "Cargo Switch off, bulbs out, cloesed door (more than 20 seconds) = ????V
0V
Yes I am very confused too, but it is good to know that it works when I put the bulbs out. So I think I will give it a try with a diode.
But due to your reactions, something is wrong or just different to the stock wiring of the cargo lamp on my truck.
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