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I found em right where juanprado said thay'd be. The one toward the passenger side next to my shiny new air governor is open circuit. I'm fairly certain this is the one for the horn and is the reason it doesn't activate...

Thanks for the info guys, I'll have another look and report back. I have a no +24v at the horn problem so I figure the fuse is suspect.

I just had a quick look on my M931A1 and couldn't find them? Do they move around with different versions? And what do they look like? Are they buried in harnesses? I'm looking for the one for my horn circuit in particular.

Nice photos, just post up videos to youtube and paste the links into a post. I'd like to see them. I'd love to get a snowplow attachment for my M939, I didn't know they existed.

Thank you sir!

A handshake would do fine lol, glad to hear youre back in business. I know the snowplowing business is feast or famine and glad you didn't miss the opportunty to pay the bills. When you find that circuit breaker, or any of the other ones, let me know where they are and post up photos if...

Keeping critical spares on hand is always a great idea. Failures always seem to happen at the worst possible time. I do not believe the PCB box is the problem in this case. I believe a fuse or some other conductor is broken and when he struck the PCB box the shock would cause the broken...

Thanks, we bought it that color. My wife seen it on the side of the road and had to have it lol. The manuals can be found at the link below and they are filled with good info. The wiring diagram is at the back of field maint. manual part 5...

The open circuit breaker would also cause the front axle lamp to not illuminate and no ether function.

I believe your problem is the circuit breaker I mentioned. I think it's in the dash wiring but have never seen it, know of it from the wiring diagram. You can temporarily run +24v to pin E (wire 27B) on the large diagnostic connector above the passengers feet under the dash to get the heater &...

When you jumped pin C to pin D power was supplied to wire 5 (pin D)which provides power to the heater switch and gages. However there is a circuit breaker (fuse?) inline before these devices. If the circuit breaker is open it would cause your symptoms.

What are the green wires connected to?

Welcome aboard! Looky in here for a wealth of info, field maint. manual #5 all the way in the back has wiring diagrams... http://www.steelsoldiers.com/showthread.php?121487-TMs-for-M939-Series-Trucks

Your proposed solution would seemingly work, however it may not be as reliable as the original design. I would guess the electric shutoff solenoid valve is rated for a high number of actuations being the device that is primarily responsible for shutdown. However nothing lasts forever and it's...

Wire 54 goes to the ignition switch RUN circuit. There should be 24V on this wire when the ignition iswitch is in RUN. Wire 82 goes to the starter motor. There should be 24V on this wire when the starter is engaged. The other wire (94?) goes to ground.

Will do Gimp, thanks. I hope to make it up to Findlay.

Sounds like water may have got in there somehow.

You would probably know better than I would. The previous owner told me duece beds and I wouldn't recognize one from the other honestly. So I have a broken bow corner and need a replacement. Should I be looking at M105 bows then?

Thank you for your offer and I'm sure I'll take you up on it someday. Same here, let me know if you need a hand, another 5ton to bail you out of something, etc. Looking forward to the road trip in April!

I like to solder crimp connections when possible, especially on stuff that is not in a climate controlled enviornment.