72 c10 250 starting issue

[Rishjr]

HI all,
My C10 started running very rough through 1st and 2nd gear the other day but 3rd was smooth. The idle was very rough, then it died and when I try to crank it, nothing happens. No starter clicking, just silence.
I recently replaced the plugs etc, and when I check them they were all fouled. But I adjusted the idle so that it wouldn't run as rich when I replaced the plugs.
In addition the generator "dummy" light was lit the day it died.
Any help will be greatly appreciated here.
Also if anyone has a wiring diagram for the motor I could use that to chase down another issue.