Did you put the knob on the meter in "DCA" 200M?

Might be easier to just put the red lead in the 10A plug and put the knob on 10A.

Then remove the negative battery cable, put the red lead of the meter on the battery cable and the black lead on the negative battery terminal. You should then be able to read draw, to test just open the door and you should seethe draw from the dome light on the meter.