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Awesome. Thanks for the insight here and helping me better understand the air system.

Just curious as my expirence with air systems is limited. How would an air leak cause high pressure at highway rpm? I will follow your advice and fix the leak first definitly and see what happens from there, but I'm just curious how high pressure at higher then idle rpm would make the air...

That was my thought as well, I just wanted to get an opinion from people who have been around these longer then me and have more expirence. I guess I will try opening up the switch and cleaning the contacts to see if that helps any.

I must have missed understood the article I read on FDC so I apologize there. Here is what I had read on FDC's: The multifuel engine operates on a variety of fuels that have a broad range of viscosities and heat values. These variations in the fuels affect engine output. Because it is...

Sure did. Pressed tab down and moved lever all the way up past the right turn signal position to the emergency flasherposition.

No. I was doing a pre trip inspection before leaving work to drive home. Hit the left and right signals and all was good. Went to check the emergency flashers and while outside the truck there were no lights flashing and when I got back in the indicator on the turn signal switch was not flashing.

So driving my M923A2 home from work I noticed the air pressure seemed to be higher then normal at just over 130 pounds. I also noticed on shutdown I have an air leak from a line going into the air governor. The leak was substantial enough to cause a drop in air pressure at idle. When driving...

So I tried searching but came up empty handed on this one. My emergency flashers decided to stop working on me the other day. I drove the truck to work and all was good on my pre trip prior to leaving the house and all was fine. I go to start the truck to go home and checked all my lights...

And just for your knowledge, the FDC is the Fluid Density Compensator. It's what helps the injection pump run fuels other than diesel (waste motor oil or WMO) through the system to allow it to get in the combustion chambers correctly.

I had a 1965 Kaiser M52A2 that did the same thing. I had a LDS-465-1A multifuel motor. I noticed a drop in oil pressure on the gauge and white smoke from the exhaust. My experience was the injection pump. The seals on it were bad and so it was leaking fuel into the oil. When I did an oil...

Battery installation looks good. Nice and clean install.

I think I will happily stay with my 100 plus degree heat and 15 percent humidity.

I have some vacation come up in a couple weeks and hope to be able to catch up with some projects on my truck as well. Been slow doing anything between work and the 100 plus degree temperatures.

The truck with the horn issues is the 813. He has a 939 bed on the 813 which is why the 939 series trucks were mentioned with the marker lights on the bed.

To start with as USAFSS stated, the TM's are extremely important and helpful with troubleshooting and fixing most any issue you may come across. If you read and follow the operations manual and follow all the PM's the truck will last you forever. That being said I know sometimes the TM's are...

Primary, secondary, or both that aren't building air?

Cool. Also like we said check all the connections. Loose connections or bad grounds can cause all kinds of trouble on all kinds of things.

As far as cost of a truck I am only on my second truck so I don't have the expertise in pricing. However, 98G has that knowledge. I sold one I had issues with and bought my current one from him and couldn't be happier.

The switch swap is extremely simple. Like 98G stated swap the button style switch for a three lever switch. It is a very simple about 5 minutes job. If it is the brake light switch it is a quick fix as well. The brake light switch is on the frame rail on the driverss side behind the fuel...

If it was me first thing I would do is get a jumper for the brake light switch and see if it is something as simple as a bad switch. If that is the case it is a very easy fix and if the price is good it would be worth looking onto in my personal opinion. There are several little things to...