I have a dx45. I was on cases website in the parts area they showed that you can get a optional 75amp alternator. Currently they only come with 40amp. I am building a cab and going to upgrade mine. I have not yet checked on a price.
I stopped at dealer today and they confirmed what you said sparker. Parts systemwas down will get price tommorow. Added a few lights for winter use alt does'nt keep up.