T&T: Cummins 5.9 High Output Alternator Large frame & belt bagel

[Jim Healy]

Hi Brian,
 
I have the exact problem you describe on my 4BT-3.9 Cummins.  I upgraded to
a Balmar HO alternator (not the large frame; exact replacement for the OEM
Delcotron), and the short contact around the Cummins alternator 6 vee pulley
causes it to squeal until the belt gets warm, then settles down.  Obviously,
I would like to correct that if possible.  The belt routing on the 4B and 6B
must be the same.  
 
In looking at it, I wondered if the belt routing could be changed, but saw
that the water pump would rotate "the other way."  So, I want to confirm
what you said.  Is Rob saying that the routing with the 90 degree contact
surface is incorrect?  Your comment: "Incidentally, after correcting this
routing problem, I can now get 200Amps out of the alternator without the
noise," seems to say that the 180 degree contact routing is correct, but I
couldn't get that from Rob's note (at least, without the pictures).
Changing the belt to get 180 degree contact would take all of 3 minutes and
really be better for the alternator and belt!!!
 
Thanks much!!
 
Peg and Jim Healy aboard Sanctuary,
currently lying St. Lucie River, Stuart, FL