Most RVers have a multimeter that will measure Amps... (up to 10A) so in a pinch, like the OPs drain, just use it for a quick test. A clamp-on is nice for higher current, but parasitic loads may not be accurate.
Place meter to Amps (in this image ONLY DC is available!)
Place RED lead to 10A connection (Note the note that it is UNFUSED!)
Ensure all known DC load is "OFF" and as David mentioned, remove 'neg' battery post connection and place meter in series with the post and connector.
With a digital multimeter, polarity is not important, but in any case the black lead would go on the neg post and the red lead to the connector.
If it is a drain, the meter will indicate "-" in front of the reading...
Do NOT measure charging current as the meter will not like anything greater than 10 amps. Or do not operate
anything as it could be greater than 10 amps. Do this only for suspect parasitic drains. Can be done on chassis battery too.
**Remember this is UNFUSED, so be careful**
When done,
REMEMBER to return the red lead back to the
VΩmA terminal before measuring voltage. I have made that mistake too many times. :-/
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