GUYS,
I AM IN NEED OF A ELECTRICAL SCHEMATIC / DIAGRAM THAT SHOWS HOW THIS OLD GRADER IS WIRED A 80C 243 CAT 12 . I  AM TRYING TO MAKE ALL THE SWITCHES WORK AND THE GLOW PLUGS BUT MOST OF THE WIRING HAD BEEN HACKED CUT FROM THIS OLE GAL. IF YOU HAVE A GIAGRAM SCHEMATIC PLEASE SEND IT EMAIL TO 
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Thanks guy's
John Perry

Hi Team,
from my grey OMI for No12 80C, Form No 10492-9 , Printed 11-57.
Cheers,
Eddie B.

Eddie B.
Exactly what I needed, I will be rewiring in the next 2 weeks when I get back home from my real job in the frigid frozen far North of Alaska.

Thanks much sir.

John Perry

is there a color code or wire size chart for the wiring ?

Not to my knowledge--if we replaced any wiring we simply used what we took out and copied the colours and sizes from old wires--they are very basic.
Cheers,
Eddie B.

Eddie B.
Once again, Thanks mr. the knowledge and info available here is outstanding.

you can make a simple code using a fine tip permanent marker and a series of dots and dashes. (which is how its done in most cars anyway)

and remember grounds should be white or black. and use different colours for different circuits.

a dymo tape label machine is handy as the tape can be easily stuck back on itself. and being printed are easy to read
wire should be tinned before ends are crimped on, better yet crimp & solder the ends on, use resin/rosin cored solder
a dab of tail light bulb grease helps conductivity and keeps moisture out of the connections, prevention is better than cure