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Does start-stop technology (In Cars/Trucks) during traffic stops cause significant reduction in life for the accessory belt and tensioner system in engines?

Assumptions 1) The belt and tensioner system are subjected to a fluctuating load during the start of the engine.

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    I cannot imagine that it would have any significant effect on the belt and tensioner since big load differences are very normal for the accessory system. Take for example the A/C clutch switching on and off and different loads caused by the alternator and power steering pump.
    – MadMarky
    Jun 4 '18 at 11:42
  • No reduction in lifespan at all. Belts get far more stress with engine running and driving than just starting it.
    – Moab
    Jun 4 '18 at 16:21

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