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1999 SLK230 Alternator / Supercharger Belt Tensioner

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by moosehead, Jul 14, 2018.

  1. moosehead

    moosehead Senior Member

    Likes Received:
    Oct 16, 2006
    Your Mercedes:
    C230/2005/2.5L Avantgarde SE Sport Pack Estate, SLK230/1999 and Volvo XC60/2017 AWD
    On Thursday the wife reported the battery light came on on her way from home. I did a quick visual on the belts and all seemed OK. I then checked the charging rate and as it didn't appear to be charging assumed it was the alternator. Before ordering a replacement I thought on would check the output directly from the back of the alternator.

    On closer inspection this morning the alternator / supercharger belt was loose and the tensioner bent / at an angle. This was a new unit that was fitted by my indie back in February when the original belt were replaced and the bearings in the old unit appeared to be a bit dodgy.

    I removed the belt completely thinking perhaps the alternator had seized. This was completely free along with the supercharger pulley. Could it just be a dodgy replacement tensioner?

    I would appreciate any thoughts.

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