Alternator Belt recommendations for new 105amp alternator

[Patches]

With the recent electrical upgrade came the new CMI 105 amp small frame alternator. For those who have made similar alternator upgrades, what belt manufacturer do you recommend for the 3/8" pulleys on your M25/M25xp engines?

Thanks,

Patches

[KWKloeber]

Posted many many times. 
The Dayco Top Cog is the best (Westerbeke dealer opinion not IMO.)
2nd best is NAPA HD. 
Search the forum and the numbers are there.
But there is variability so best to take a belt that fits or measure what you need.

[Stu Jackson]

Patches, I've been running my 100A externally regulated Blue Circle alternator since 2003 with a 3/8" Gates belt from Napa, 7395 length.  I have written extensively about the use of Small Engine Mode vs. amp (belt) manager, see the Electrical Systems 101 topic.  Both ES 101 and Critical Upgrades have specific alternator alignment important information - I was a test tube baby for Maine Sail's admonitions.    A friend recently bought a new alternator, and I stressed these issues to him repeatedly.  There is no way to assure a new alternator will be in the same alignment as the old one, so go through those posts and get it right.  Once you do and manage the loads on the alternator, my experience is that a good belt will do just fine, although better and superior  belts wouldn't hurt.  And when you find the right length, buy a few more and you'll be set for years to come.

[Stu Jackson]

Like this from ES101:

Using a 3/8" Belt on a Larger Alternator
https://c34.org/bbs/index.php/topic,10702.msg83288.html#msg83288

[Ron Hill]

Patches : I agree with Stu on a Gates belt.  I'd start with a 7395 belt length and try that for size. 

Depending on your alternator pully, you might need one size larger or maybe smaller??  Most dealers will swap a belt back if need be!!

A few thoughts