Where can you find a wiring schematic for a 1995 kenworth w-900 with an n-14 cummins?

Your best answer is to go to a Kenworth dealer about this. Not only because they're going to be the most authoritative source on the matter, but also because they can research the truck better than you can, and can be made aware of any oddities in how the truck is configured. A lot of fleets order their trucks with bizarre schematics.. just to give an example, the W900Ls ordered by Swift had a much different wiring setup than a W900L manufactured for a dealership sale.