lazylady Posted September 27, 2009 Share Posted September 27, 2009 we have 71 ford tandem truck the low pressure buzzer stay on all the time we bought air brake govner and low pressure indicator can any heipme please Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/ Share on other sites More sharing options...
HK Trucking Posted September 27, 2009 Share Posted September 27, 2009 Is the air pressure actually low while the buzzer is on, or is the air pressure normal (105 - 120 PSI)while the buzzer is on?That would help us to narrow it down.. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41053 Share on other sites More sharing options...
lazylady Posted September 27, 2009 Author Share Posted September 27, 2009 Is the air pressure actually low while the buzzer is on, or is the air pressure normal (105 - 120 PSI)while the buzzer is on?That would help us to narrow it down..its always on just bought indicator and still doing it Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41060 Share on other sites More sharing options...
Freightrain Posted September 28, 2009 Share Posted September 28, 2009 The "indicator" sounds like only the light/buzzer? If you didn't replace the pressure switch then likely that's the culprit. If you replaced it and the buzzer still sounds, then the wiring is shorted somewhere. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41088 Share on other sites More sharing options...
lazylady Posted September 28, 2009 Author Share Posted September 28, 2009 The "indicator" sounds like only the light/buzzer? If you didn't replace the pressure switch then likely that's the culprit. If you replaced it and the buzzer still sounds, then the wiring is shorted somewhere.ok thank you very much Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41098 Share on other sites More sharing options...
lazylady Posted September 29, 2009 Author Share Posted September 29, 2009 ok thank you very muchwhere is the pressure switch located at Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41101 Share on other sites More sharing options...
Freightrain Posted September 30, 2009 Share Posted September 30, 2009 If no one can find it here, then ask Michelle. www.michellesfords.comShe's into Ford trucks, big and small(she just restored an N model truck). She might have some information for you. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41174 Share on other sites More sharing options...
lazylady Posted October 3, 2009 Author Share Posted October 3, 2009 Is the air pressure actually low while the buzzer is on, or is the air pressure normal (105 - 120 PSI)while the buzzer is on?That would help us to narrow it down..i have bought 3 new indicators and my husband says thy are bad thy lose air i spent over 100.00 for 3 the buzzer and pressure switch is good can you help me find one Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41337 Share on other sites More sharing options...
Freightrain Posted October 3, 2009 Share Posted October 3, 2009 I'm curious to what the "indicator" is? Are you talking a "wig wag", or "low air flag"? That comes down to warn of low air? That could lose air if the diaphram is bad. It's just a rubber disc inside, and tend to get old and brittle.The pressure switch works a light on the dash, or a buzzer(that you say works). I'm thinking that by your description that it all works fine. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41342 Share on other sites More sharing options...
lazylady Posted October 3, 2009 Author Share Posted October 3, 2009 I'm curious to what the "indicator" is? Are you talking a "wig wag", or "low air flag"? That comes down to warn of low air? That could lose air if the diaphram is bad. It's just a rubber disc inside, and tend to get old and brittle.The pressure switch works a light on the dash, or a buzzer(that you say works). I'm thinking that by your description that it all works fine.its up above the break paddle ita called low pressure indicator Quote Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41345 Share on other sites More sharing options...
Freightrain Posted October 5, 2009 Share Posted October 5, 2009 Ok, so you have a light and a buzzer. The buzzer is staying on all the time, thought the light goes out? Well, sounds like the wire going to the buzzer is shorted? I'm not familiar with how it's wired, but if the pressure switch "GROUNDS" the buzzer, then likely the wiring going to the buzzer is grounded inbetween the switch and buzzer, thus leaving the buzzer on all the time. It's likely a simple fix overall, but you need to trace the wiring.Quick schematic to show you what I mean:12v+(bat).................(buzzer).....................(switch).................battery -If the buzzer is grounded(battery -) before the switch, then it will stay on no matter what. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/10821-low-pressure-indicator-and-buzzer/#findComment-41451 Share on other sites More sharing options...
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