yup, purchase the alternator from Rockauto.com cost is under $150 for rebuilt unit, if your planning on a adding serious electronic accesories then get the ML320 4x4 alt.

oh and stay away from the French units that come with the car the bearing and electronic components are shiit, get the MBZ unit it's made in England and has a better regulator and bearings.

I pulled my right from wheel out and disconnect the wiring and bolt. remove from above or below, it's a 4 hr job for the inexperienced.