IF you cant get any cranks I would put a voltmeter across the battery terminals and see what it reads.

If that checks out check your fuses, relays and electricals to ignition system. Also check ground connections or anything not connected.

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