LITHIUM LOAD TESTING A 200 A BOSCH ALTERNATOR

This blog post is a placeholder containing two video clips of our 200 A Bosch alternator.  We took these as we were trying to ascertain why our previous alternator's clutch pulley failed at 17 months of age (original blog post here; Sprinter Forum discussion commences at post #110 on this page here).  Was it caused by the dynamics of the lithium charging?  Or was it an unrelated failure?

It's very difficult to tell.  These two tests do not represent actual vehicle operating conditions, which would include high engine RPMs, cab a/c cranking and placing its own load on the alternator, other vehicle systems engaged, road roughness contributing to vibrations, etc. 

The results are utterly inconclusive.  There is evidence of pitch changes when the lithium charging loads are applied and removed, but no obvious thrashing of the belts, or visible vibrations, or anything like that. 

I'll have more on what we plan to do about this failure in future posts, but in the meantime, here are the views from below and above.