2011 2500 charging issues

[gmc man]

I posted this question before and didn't get any good info.So I figured to try again as some time has passed and the issue is not yet solved.
My 2011 2500 HD SLE is set up with a plow package.When plowing and operating the plow(Fisher)the volt gauge drops off drastically.This is typical,as with electric hydraulics,as it also happens with my 05 2500 plow and 04 3500 dump.My issue is recovery time.The other trucks recover immediately while the 2011 sometimes will take 3-5 minutes to show typical 14 +/- volts on gauge.The recovery is the same even if I throw it in neutral and rev truck!
I brought the truck to both Fisher and GMC dealer,both saying it is normal;BS!
There is a thread on plowsite about this with many people complaining about the same thing.
One response said his was fixed with a body control reflash????PLEASE HELP!!!

 

[Z15]

I believe the GM dealer and the Fisher dealer are correct.

Are you aware, alternators operate differently on the 2011 than on the other trucks you have? These vehicles have Electric Power Management (EPM) that estimates the battery’s temperature and state of charge. It then adjusts the voltage for best performance and extended life of the battery. When the battery’s state of charge is low, the voltage is raised slightly to quickly put the charge back in. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gage, you may see the voltage move up or down. This is normal. If there is a problem, an alert will be displayed.

 

[lnxtinman]

i noticed the same thing on my '11 and the dealer printed out the tsb about it showing it was working as it should...the above poster is correct.