Red is power coming in from the main harness splice and ammeter circuit
Black goes out to feed acessories through the fuse panel. It is "hot" with the key either in run or accessory
Both the two above are large either no12 or no10 gauge wires
Dark Blue feeds out to ignition and the regulator, is hot only with key in "run"
Yellow is hot in "start" and engergizes the start relay when the transmission is in park/ neutral (automatic)
Brown is hot in "start" and feeds voltage directly to the coil + for a hot spark during starting