Tonight the belts started spitting and screaming on the 1984 300DT; somehow the belt tensioner on the alternator had loosened plus the 17mm nut on the back side of the alternator holding the long bolt connected to the tensioner had also come loose. I could literally move the alternator around with my hands...NOT GOOD!!

So....I tightened the tensioner until the belts had approx 1/2" play then retightened the 17mm nut. Question, to keep this from happening again I'm thinking of putting green thread locker on the 17mm nut to keep it from coming loose.....

feedback is appreciated.....