Edward,
Have you checked the voltage reaching the fluorescent light?
Does this happen with engine running?
If the battery voltage falls below ~ 11.5V, this seems to be insufficient
for the inverter circuitry (that powers the bulb) to operate. Perhaps you may
have a battery problem rather than a light problem?

I have this with my Westy (replaced the standard 3-bulb unit with a fluoresecent
unit) due to 2nd battery not holding charge [it works fine when
the engine is running].
Mike
'87 Westy

> My light seems to be on the blink, so to speak.  I replaced the bulb
> a year or so ago.  Now it acts like it is trying to come on, but
> doesn't.  The ends glow, but it doesn't come on.  Is there a way to
> test the output of the fixture or the bulb with my multimeter?  Or
> should I just spring for a new bulb to try in it?
> Edward

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