Hello davyfireball,

If it has an filament you can use an ohm meter. Infinitive
resistance= bad bulb,

Guido.
 
(quoted from post at 15:02:19 06/28/19) Dog gone thing has a fluorescent bulb
Just went out to look at it - no sparky -so transformer is shot / kaput
Had the same problem and I just wired it for incandescent bulb.
Been using it for several years with 40W bulb.
 
I have used 'Jake's theorem' for years and it seems plausible.

If ya plug it in, turn it on and it don't work......good chance, it's broke.
 

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