About 8 months ago my altenator went out and I drove down to my local "boneyard" MB Auto Shop. I bought a used altenator for my SDL for about $100. and had him put it on. All in all it cost me about $180. Well it went out the other day and I went back and got a new Bosch and installed it for about $275. after labor. So my altenator problems have been costly. So much for getting a used altenator.