Greetings,
I am driving a '99 C2500 7.4L GMT400, and as far as I know there aren't too many changes between it
and the '00 models, since they were both mature carry-over designs targeted to fleet operators and small business
owners.
The reason I mention this is that given the above the '99 C/K manuals in reply #77 of the Service Manual thread
should work well for you. (
LINK TO '99 FSM listings) As you might be aware, the 1st .pdf file is for Vol 1 & 2, and
the 2nd .pdf file is for Vol 3 & 4. Since the Electrical wiring diagrams are in Volume 4, try downloading that .pdf file
first and see if the wiring diagrams don't match your '00 vehicle.
Best of luck, and let us know if the '99 manuals work for you or not. I'm guessing that they will, but it would be
much more helpful for others if you could confirm my theory.
Cheers --