Put the scanner on it, see if there are any codes.  Or just see if getting power at the starter relay in the fuse box which will indicate if the ignition switch is sending electrons.  Then jumper the relay contacts to see if the starter spins with key in pos2. that was the problem on the $675ML500, I could get it started by jumpering the relay.  I rigged up a pushbutton momentary switch on the relay pins to start it before I got the new ignition switch.

I'm not entirely sure how these work being newer but I am guessing it is probably a similar system/circuit

--FT

On 1/2/21 11:28 AM, Andrew Strasfogel wrote:
How would you diagnose on the spot?

On Sat, Jan 2, 2021 at 9:28 AM Buggered Benzmail via Mercedes <mercedes@okiebenz.com <mailto:mercedes@okiebenz.com>> wrote:

    That could be tempting if indeed it is just the starter. I wonder
    what the symptoms are. Might be just the ignition switch, was $25
    part on the 05 ML

    --FT
    Sent from iPhone

    > On Jan 2, 2021, at 12:39 AM, Allan Streib via Mercedes
    <mercedes@okiebenz.com <mailto:mercedes@okiebenz.com>> wrote:
    >
    > mechanic said must change starter
    > Privat owner, title in hands
    > No low ballers!!!
    > Don't have time for fixed
    >
    >
    
https://chicago.craigslist.org/wcl/cto/d/plainfield-mercedes-benz-gl350-bluetec/7255155280.html
    >
    >
    > _______________________________________
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