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Well one thing he asked was how to hook up the horn button on a m939 steering column. Since I dont know anything about the older 800's trucks thats all I tried to provide. Someone else can provide the rest.

Your right I misread it, I thought the switch icon was the solenoid ! I guess its time to get some glasses. So it is wired like a typical horn button, so replace the 24v+ with ground in the above!

Is this on the M939 or the m1070. I thought I saw the solenoid grounded on the M939 wiring diagram. I will have to look again. The extra horn button for the m1070 is like the automatic trans, to make it more "familiar" for the average person, you wont see either one on many big rigs.

Do you have electric horns? If you have air horns like the m939 you can hook up an air valve like most all big rigs. its just a mechanical air valve with a chain that is normally located to the right of your head above the front door. You just pull the chain when you want to blast the horn...