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So I figured out what the culprit was. As some of you suggested, the wire to the horn had actually broken. It appears that in my messing around I managed to get it to short. I unhooked both wires and that solved the issue.

No it’s definitely not the low pressure alarm, it was working as well. This sounded like it was coming from near the center front of the cab. It was so loud that I could not pin point the location. I am going to look at it again this morning.

So I drained my air tanks free running my 1970 m35a2. After draining the tanks, I also replaced the light switch and discovered that the wires were broke right before the flasher Relay. After putting it back together, I started up the truck and after 20 seconds or so, it started howling super...