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Around here it's either NAPA or Advance. Pick your poison.
I buy my parts from two main warehouses and they are nationwide.
Thier main focus is foreign, but they do carry some domestic stuff.
These guys even have new Alliant AD diesel injectors. www.worldpac.com
They carry Bosch rebuilt and new if available for the alternators.
And thier online catalog is the best around. VERY slick!
Wish I had something for you, but a dead cell was all I could come up with... Kwik had mentioned once coming straight from the alt to the battery with a 6awg wire, might be an option.