Join Date: Sep 2012
Location: Central Valley, Sierra Mountains, California
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No there is nothing out of line if your using a stock alt. they are 110 amps and are underpowered for sure.
Voltage will drop down to the 11 volt range after starting due to the draw from the glow plugs and climb slowly as they phase off. This can last up to 2 minutes temperature dependant then the oem alt starts catching up.
But even upper 12 volts is common with the oem
DC Power alternators are great, I have the 190 amp and it never drops below 12 volts right after starting and climbs up to 14.3 as soon as glows cycle.
One piece of advise for your install: Get yourself two 4 gauge cables 24" long with eyelets on both ends.
Put one on output post of alternator then to positive post on passenger battery.
Put other on passenger battery ground post then to engine block. I put mine up on top of intake near alternator.
This will help with immediately charging after starting truck. There is a ground relay that shunts until glows cycle according to Ed w/Ficmrepair.com.
I will say it works so if your 185 amp or more I recommend it.
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