BenzWorld Junior Member
Date registered: Jan 2006
Vehicle: 1996 W210 E320 ELEGANCE, 1972 W108 280SE 3.5, 1969 W108 280S, 1971 300SEL 3.5
Location: Melbourne, Australia
Mentioned: 0 Post(s)
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Yes, it's the extra load from the electrics causing the belt to squeel.
If the belt is new and tight I would recheck the adjustment and I would look for the reason causing this, could the battery be a little on the old side or too small? so therefore not able to keep up with the demand.
The battery stores the energy that the alternator produces, if there is not enough energy/current stored in the battery, the system will rely on the alternator for power.
Being that your car is a diesel, once the motor is started you can take out the alternator and battery and she would still run, everything else relies on the battery for power, if there is not enough juice the alternator takes over.
I hope this helps, and guys, if I'm wrong please correct me.