In message , David
writes
I am trying to fault find a fluorescent light on the 12V circuit in our
motor home.

Opinion seems mixed, but there are several postings which claim that these
are actually 240v AC lights with a built in inverter so that they can run
off 12V.

There is certainly a lot of circuitry inside.

Firstly, do camper/caravan/boat 12V fluorescents usually run at 240V with
a built in inverter (or sometimes)?

Secondly if so is there usually clear marking of the 12V and 240V parts?

I don't particularly want to probe a 240V AC circuit with the 50V DC part
of my little multi-meter.

Cheers

Dave R

If it is fluorescent then it will have high voltage on it, a tube of
this type will not run at 12V. Could it be a filament tube, a long
light bulb? If so it would likely be 12V, but if there is "a lot of
circuitry" then it is almost certainly an inverter, providing it does
have 12V feeding it I would first suspect the tube, very cheap from any
lighting shop. If the tube is old and the temperature cold then it
would not be unusual for it to have failed.

Have "fun" :-)

--
Bill