[Fasteddie]

I have attached a photo of the single belt setup on my coach.  Note that I have a small pulley on the alternator, but also note that the serpentine belt contacts a lot of the pulley groves due to a belt tensioner.  I would be concerned that changing to a larger alternator pulley would substantially reduce its output. Ed and Adrian, I wonder if if there is a way to install a tensioner rather than changing pulleys.

You are correct in the reduction of the output, but so far it has not been a problem, only when at idle. Gordon sent me some pictures of someone who did put a belt tensioner on for the v belts, but was a lot of work and custom parts were needed if I remember and changing to serpentine belts is very expensive? Like Richard said it is an inexpensive way to hopefully fix the belt problem (so did Creslie Clark) and so far it has done that and have not had any low battery problems.