Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
Thanked 135 Times in 124 Posts
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Well, I dont have a 58 volt ficm but I dont see why you should have different voltage during buzz. Have you watched the ficm power and logic power at the same time, also how about at different speeds and operating temps.
If I had to take a shot I would say your ficm has a issue, and the fact you have been down on batteries it may have raised problems with ficm.
Do you have a way to check volts and amps for your charging system.
2006 F250 LARIAT CCSB 4X4
ARP Studs, O-Ringed Heads
X4 PHP 65 HP Custom Tow Tune
Atlas40 or Atlas80 Ficm Tune
CAT EC-1 Coolant, IPR Coolant filter
BPD Waterpump, BPD way of thinking
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
Die Hard Platinum AGM all 2/0 Cables
Fabtech Radius Arms
7" lift w: Icon Progressive Coil Springs
2008 up Carli/Deaver rear springs
All riding on some Fatty-Daddy 38/15.50/18 Toyo's