forgive me im new to the nc30 , but im unsure if this is normal, with lights on only the right tail light is on, when i brake the left lights up , i assumed both lights would be on and both would get brighter when brakes were applied

Deviant400 wrote: i assumed both lights would be on and both would get brighter when brakes were applied

Your assumption is correct.

Check the globes aren't blown (they're dual filament) and that the plugs are all plugged in, the bullet connectors can come apart easily.

You'll need to take the seat unit off to check them (6 bolts).