Dash Alarm won't quit
We have the same problem on our Freightliner chassis. I called Freightliner and they said that the cables on the back of the gauges should be black, this was to correct the problem. In my case there are 2 bundles of wires on the back. I found that if I disconnect the large bundle the sound would stop. If I put the plug back on easily the buzzer was still there. If I pushed it on hard no more buzzer. Also none of my gauges worded when the buzzer was on. After pushing the big cable connector on hard I had no further problem.
2008 Thor, Four Winds Mandalay 40G. Cummins 400 isl. Freightliner chassis