Fleabay will be your friend on this for manuals, even as I am not fond of Ebay. Can do a Google Search for Case 780B Manuals, usually those on ebay and what is also being sold at other sites will show.
Turns out you can get them from
www.casece.com, $US50.00 for the operator's manual.
M will control/energize your ether start solenoid.
Have to see if that is working before winter returns. Don't expect to be using it this winter, but it would be nice if it would start.
N, O and P will be lights or some such.
head lights/tail lights, rear flood lights and 4 way flashers, according to the manual
I think D is your turn signal switch.
Correct.
I, is exactly what is says. You have an air operated clutch cut out. When activated, the brake pedal will put the shuttle in neutral. Prolly the left one.
I had never heard of such a thing before, so was not sure of its purpose in life. Being air activated, I assume that lever is for an air valve and it should turn relatively easily? 'Cause it doesn't want to move.
...
Q, May be a low air pressure warning light, a buzzer should sound off when the air pressure drops to about 60 psi.
According to the manual, that should be a switch; for the amber light on top of the cab. Things that make you go "hmmmm".
R, Should have a push button switch for checking if all the dash lights work.
That is possibly the best idea I have seen; a way to know that your warning lights actually work.
As you may know you have air brakes, There should be a steel bar on the pedals that you can use individual brakes or both at the same time when roading it.
Air brakes, yes, that loud hissing noise that scares the crap out of me 'cause I'm not used to it yet.
The amber warning light on the top of the cab has a switch and the cab heater also if it has a heater
There is a bunch of switches up on headliner that I haven't gotten around to worrying about yet. Glad I'm not planning on putting this to work until the spring.
C looks like a battery disconnect switch.
I think you are right, based on the gauge of wire running up to it. The manual doesn't show any such switch so this might have been somebody's way of dealing with electrical problems.
Thanks for the help guys, appreciate it.