TTGTR, look up Slick GT1's old thread from last year, he didn't just replace the brushes, but the ENTIRE VOLTAGE REGULATOR, about 100 bucks from the dealer. I think all you need to know is whether you have a Bosch or Valeo alternator.

He seemed to think it was easy, but you're right, either way you probably need alternator attention! How old is your battery?

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards