Date registered: Jul 2005
Vehicle: 90 300E, 99 ML430, 00 ML320, 05 E500 4matic Wagon
Mentioned: 18 Post(s)
Quoted: 877 Post(s)
You can just bridge the connectors with a thin screwdriver. However it is an "at your own risk" suggestion.
Other people have taken just the positive lead from a jumper cable and attached it to the positive post on the starter and then touched the other positive end of the jumper cable to the battery's positive post.
If the starter is good either method will immediately spin the starter. If there is no spinning of the starter then it is suspect.
Just curious, have you exceeded the mileage on the warranty? If it is still under warranty I would leave it and just have the dealer handle it. If it is under warranty and they think you were tinkering with it they will bounce the warranty claim.