Bulbs maybe fine but it's possible you have:

1: Corroded fitting in a bulb holder.

2: Most commonly with a disco, it's the plug slipping off the holder on the lights in the bumper if you have a 300 series. Put hazards on, go to the rear bumper indicator and push on the fitting (wire) and you'll find it'll work.

3: If you have fitted LED indicators on the right, it maybe because it's such a low drain used it causes the relay to flash fast as though there was no bulb.
 
will look at earth, will check the light in the bumper - missed that one :doh:

at the weekend and report back if not solved!!

cheers
 

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