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  #1  
Old 05-12-2016
danjames danjames is offline
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Default Low air buzzer

Any suggestions where my low air buzzer might be. I have located two buzzers. One (in front end compartment driver side) traces back to the level jacks. The other (underneath the main dash panel left side) is for the headlights on - key off. My low air buzzer and light aren't working and I suspect a loose/broken connection. Pressure sensing switch is confirmed closed with ohmmeter. Schematic shows warning light connected with ground side of buzzer. I've looked everywhere I can think of. 87pt40
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Old 06-02-2016
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paflyboy55 paflyboy55 is offline
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Daniel,
Not sure on yours but my pressure switch was bad and it was mounted on the fitting that comes out of my right air tank. I got a new one from the local truck shop fer $12 and it fixed my light and buzzer.
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1982 FC-35 SB
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Old 06-02-2016
danjames danjames is offline
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Thanks for the reply Jack. But I'm pretty sure my switch is good. Checked it with a meter and also grounded the terminal on it and still no buzz or light. What I can't find is the darn buzzer. I think I've found every buzzer on the bus but that one. I believe it's probably the wire in between or a connection. I'd like to find the buzzer to help trace it.
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Old 06-03-2016
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iamflagman iamflagman is offline
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Quote:
Originally Posted by danjames View Post
Thanks for the reply Jack. But I'm pretty sure my switch is good. Checked it with a meter and also grounded the terminal on it and still no buzz or light. What I can't find is the darn buzzer. I think I've found every buzzer on the bus but that one. I believe it's probably the wire in between or a connection. I'd like to find the buzzer to help trace it.
Check out Wanderlodge Owners Group > Mechanic's Corner > Tires, Wheels, Brakes, Steering and Suspensions > Low Air Pressure Indicator Switch and Buzzer

Here is where the buzzer is located on my '82FC35RB post
#42 in that thread:

Quote:
Originally Posted by iamflagman View Post
On my '82FC35RB the Circuit Breaker is located behind drivers side headlight door upper

CB row #3 from left 14ga tan wire should be center of three 20a CB
connected with a bus bar, with orange/brown hot wire feed. Buzzer itself is located under dash next to parking brake set valve devise.



Low Air/Vacuum Warning Buzzer
  • 12 volt buzzer.
  • 9/32 inch diameter mounting holes.
  • Use in conjunction with a low pressure switch Part No. 034041 or 034042

http://velvac.thomasnet.com/item/air...-buzzer/036043?#



Low Pressure Indicator (LP-3 Style)



1/4 inch NPT supply.
Automatic pressure release at 60 ± 6 psi.
Replaces : Bendix 279416.
034041Single Terminal 034042Double Terminal



http://velvac.thomasnet.com/item/air...34041?&seo=110
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Old 07-07-2016
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paflyboy55 paflyboy55 is offline
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Well now that we're on a trip, every time I shut down the engine for more than 20 minutes and go to restart the buzzer and low air light are on. The gauges still show well above 100 psi. Light and buzzer shut off after 20-30 seconds of idle. Could the new switch be bad or could I have a leak in the line somewhere that isn't draining the tanks? I haven't had the time to climb underneath to listen for a leak.
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Old 07-07-2016
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Bill Pape Bill Pape is offline
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The gage shows the two brake tanks,
There may be a leak in the suspension or accessory tank, one of the low air sensors is on the first tank,
curb side just forward of the step
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Old 07-07-2016
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Yes Bill that's the switch I replaced. As to the suspension, the air bags seem to keep their pressure. At least it doesn't seem to drop down at all. I think that must narrow it down to the aux tank.
Thanks
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Old 07-08-2016
dennis hight dennis hight is offline
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Daniel I have the same thing the low air light and buzzer stopped working on our last trip. My pressure switch is good I agree loose or broken wire I have not looked into it yet . I'm going to start at the dash.
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Old 07-08-2016
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Quote:
Originally Posted by paflyboy55 View Post
Well now that we're on a trip, every time I shut down the engine for more than 20 minutes and go to restart the buzzer and low air light are on. The gauges still show well above 100 psi. Light and buzzer shut off after 20-30 seconds of idle. Could the new switch be bad or could I have a leak in the line somewhere that isn't draining the tanks? I haven't had the time to climb underneath to listen for a leak.
some BB's have an air gage at the dump valves, this checks the other tank
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Old 07-08-2016
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rrueckwald rrueckwald is offline
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The last tank in the system is the aux tank and that is the one most of the leak prone plumbing is tied to, such air step, air step cover, air horn, dump valves, air seat, etc. The only gauge for that aux tank, as Bill says, is on the water panel. We all make a career out of finding leaks and some go so far as replacing those air fittings with non-leaking DOT fittings. The main air tanks must be up to pressure before they will start filling the aux tank.

Hope this helps.
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