with the grounding test , test on each earth bolt. the parasitic draw have every thing turned off, disconnect earth, set your meter at 10 amp and change the red input on meter ,connect alligator clips between terminal and earth lead. pull fuses one by one. if you have long probe leads put meter on windscreen while working inside, tape door light switch. when amps drop nearly to zero , thats where the issue is. then if problem is not obviouse follow the fuse wire to connector ,seperate and probe each wire, you need wirring diagram to identify colour and what it supplies