Processing could be a little better ...

I needed after installation, disassemble the tail light again. In the second assembly is already one of the studs has rotated to the back, so that the lamp no longer read fasten neatly!
The studs must be fixed with thread lock fluid, thus re-fastening was possible.
The function is OK if the two batteries are loaded only once, is also described the parking light function.

2 star deduction, because I expect that such a rear light must be mounted more than once.