Doug T B42X Posted July 2 Share Posted July 2 When I got this truck, the low air pressure buzzer worked normally, shutting off at about 60 psi. Then it started going off all the time. Then stopped entirely. Now it is back to going off all the time again. This truck has great air, no leaks. Where is the buzzer located? What is involved in changing it? Thanks, Doug Quote Link to comment https://www.bigmacktrucks.com/topic/74316-b42-low-air-pressure-buzzer/ Share on other sites More sharing options...
Geoff Weeks Posted July 3 Share Posted July 3 There can be a few reasons, wire shorting to chassie, but the most likely reason is the low air pressure switch. Where that switch is located will take someone with more knowledge of the "B" line than I. Often they are around the brake valve, but can be other places as well. Quote Link to comment https://www.bigmacktrucks.com/topic/74316-b42-low-air-pressure-buzzer/#findComment-554646 Share on other sites More sharing options...
Doug T B42X Posted July 3 Author Share Posted July 3 Thank you. I'll look around for that tomorrow. Quote Link to comment https://www.bigmacktrucks.com/topic/74316-b42-low-air-pressure-buzzer/#findComment-554648 Share on other sites More sharing options...
Solution HarryS Posted July 3 Solution Share Posted July 3 The pressure sending unit on my B is on the passenger side firewall just below the shutter valve and the buzzer is under the dash behind the instrument cluster. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74316-b42-low-air-pressure-buzzer/#findComment-554660 Share on other sites More sharing options...
Doug T B42X Posted July 8 Author Share Posted July 8 Thank you. I just removed one of the wires and taped it up. Quote Link to comment https://www.bigmacktrucks.com/topic/74316-b42-low-air-pressure-buzzer/#findComment-554883 Share on other sites More sharing options...
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