do they fully come on.

On mine, the side lights are accompanied by a "dim" dipped beam, second click gives you full dipped beam (if that makes sense)
IIRC I read somewhere that this dim dipped beam is controlled by a resistor under the wing somewhere (possible drivers side) if this goes short circuit, it would give you a normal dipped beam with side lights.

Mine is same as above. Got a '96 300tdi fender, and first switch puts little sidelights on plus dim dipped beam, second switch does full dipped beam. most other fenders I see around only have little sidelights on so have often thought mine was in the wrong, but she passed her mot last month :D
 

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