I am trying to measure amp draw of devices to isolate what is draining the battery down on my 1991 190E 2.6. There are specs for how many miliamps each device should draw. Is there a way to test this with a DVOM or do I need a inductive ammeter?

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)