Live to 6, Neutral to 1, join 3 and 4. Job done
Test with a lamp limiter, as Peter says. Use the smallest bulb you have - no more than 40W.
The tappings on pins 2 and 5 are probably for 110/220V use. I agree that the DMM might be confusing the issue somehow, although it's not something I experience. Perhaps if it is pulsing the test current? Normally a DMM supplies a known (and steady) DC current.