1) black test lead on com on meter,other end to positive battery cable.
2)red lead on 10 a, other end hooked to battery (use a aligator clip to secure)
3)move dail to A dc/10a
4) make sure car is off,doors/trunk closed
5) let me know how many amps it shows,less than .5 (1/2a)is acceptable.
if shows more UNHOOK meter and pull dome/horn/cig lighter fuse.then read again,keep pulling constant fuses untill meter is in range .5a or less.once you find the fuse that cures problem,find out everything that runs on said fuse.