Stuck in Commiefornia...
Join Date: Dec 2008
Location: Utah, SLC area.
Thanked 445 Times in 314 Posts
I would want to know that the output at idle is the same or better. Just because the peak output rating is higher doesn't mean the idle output is. I would be concerned that it is in fact reduced to accommodate the combined charge output of two alternators from the dual system. At the bare minimum, the pulley difference is an indicator that an engineer saw a need to slow it down slightly (3%). Your alternator repair shop should have a test stand to verify the outputs and be able to give you some additional insight.
Amps are like torque in the electrical system, if they aren't available where you need them, they aren't of much use to you.
The Current Truck (Oct-2013 to Present):
1999 (Early) F-350 Lariat, CCLB, SRW, Black/Tan
7.3L Powerstroke, 4R100, 4x4, 3.73, 37x13.50-18s, '05 Axle Swap, 6" Fabtech lift, GTP38 "D66" turbo upgrade, SCT 4-position chip with custom tuning by me, Straight Piped 4" down pipe through 5" dual stacks, N-Fab full length triple steps, Pro-Tech cab guard and tool box, louvered 5th wheel gate, Hella 500 Fog and Driving lamps, much more to come...
The one I'll miss, (Mar-2009 to Jan-2014):
2000 Excursion XLT 4x4
6.8L V-10, 4R100, 4.30, 285/75-18, 271whp / 388wtq
The one I won't, (Jul-2005 to Sep-2012):
2005 F-350 XLT, CCLB, SRW, 4x4 FX4
6.0L PSD, ZF-6S650, 3.73, 35x12.5-18, 4.5" Lift