Not certain where you battery is located. In my E class it is beneath the rear seat.

There should be a + battery stud in a 2" x 3" plactic cover with a red + on it inside the engine compartment. On mine it is close to the drivers side fender. You have tto find your own ground point.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)