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1998 379 low air warning light

Discussion in 'Peterbilt Forum' started by tmslogistics, Mar 13, 2015.

  1. Mar 13, 2015 #1
    tmslogistics

    tmslogistics Light Load Member

    138
    15
    Mar 10, 2015
    0
    I'm back!! Thus is what you do when you have an old truck. Lol.

    Two days ago I replaced my brake light switch which is on the floor in front of the brake pedal behind all the plastic. Today, with the key in the off position, my low air warning buzzer and light stay on.....even though I have plenty of air. When I put the key in the on position, the buzzer goes off.

    Any ideas are greatly appreciated.

    Thanks a million for your help.

    Thanks,
    Toby
     
    tmslogistics, Mar 13, 2015
    tmslogistics, Mar 13, 2015
    #1
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  3. Mar 13, 2015 #2
    tmslogistics

    tmslogistics Light Load Member

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    Mar 10, 2015
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    Also....with the key in the off position, my ac blower motor will come on with the switch. Weird.
     
    tmslogistics, Mar 13, 2015
    tmslogistics, Mar 13, 2015
    #2
  4. Mar 13, 2015 #3
    tompetty69

    tompetty69 Light Load Member

    108
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    Jan 9, 2015
    TX Panhandle
    0
    Sounds like you might have knocked the low air pressure sensor or a wire loose or switched whenever you replaced the brake light switch. They are right there together in the floorboard. Try replacing the sensor if you don't find anything obvious. My truck was getting some water down there during very heavy rains and the low air buzzer would stay on (maybe down the vent holes near the windshield?). I think my sensors were labeled. Anyway we put a plastic bottle cap cover over the new sensor and so far so good. Old trucks are all that I will own. I've had he new ones and they like the shop too much then they can only go to Peterbilt or Cummins to be repaired. Good luck.
     
    tompetty69, Mar 13, 2015
    tompetty69, Mar 13, 2015
    #3
    tmslogistics Thanks this.
  5. Mar 13, 2015 #4
    tompetty69

    tompetty69 Light Load Member

    108
    43
    Jan 9, 2015
    TX Panhandle
    0
    I don't have any answers for your blower motor.
     
    tompetty69, Mar 13, 2015
    tompetty69, Mar 13, 2015
    #4
    tmslogistics Thanks this.
  7. Mar 15, 2015 #5
    tmslogistics

    tmslogistics Light Load Member

    138
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    Mar 10, 2015
    0
    I pulled the fuse labeled ACC UNSW. my buzzing stopped.

    Anyone know what else runs off of this circuit?
     
    tmslogistics, Mar 15, 2015
    tmslogistics, Mar 15, 2015
    #5
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