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Hi,
I assume you're talking about the little rubber ring between the two pulleys ? if so then I think it's there because the pulley speed is different between the 2 belts. One is for the alternater the other one is for the fan. If I recall correct the CUP way is to have only 1 belt is to lock together the two pulleys on the fan/alternator, and then replace the lower pulley with one that only has 1 groove.
There is a switch on the 2 belt/pulley solution that detects when the fan belt breaks.
Michael
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