blown rear bulbs
Had a similar problem once with another bike. If all avenues of electrical troubleshooting fail prhaps you have the same problem I found.
The rear light unit was rubber mounted standard in a way to quell vibration . But the rubber mounting was so flexible that it allowed too much movement and the unit was smashing about too wildly. This was why the light filament kept breaking, because it was always on, hot and fragile. The brake filament was mostly cold and could stand the beating a bit better.
Solved problem by adding a stiffer rubber shim block
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