Bilge Blower Circuit Breaker tripping

Discussion in 'General Maintenance/Repair Questions' started by dtfeld, Dec 14, 2019.

  1. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives
    My port bilge blower is tripping. I'm trying to figure out if the blower is pulling to much current (maybe corroded wire), or if the breaker is failing. Blower itself looks in good shape and sounds normal (loud). Do these circuit breakers "wear out"?

    The other interesting thing is once it trips, the blower switch on the dash goes from steady on to flashing. Must be some logic in there somewhere.

    Any advice? Hate to throw parts at it until I think I know whats going on.
     
  2. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Check all connections, then get an inductive amp probe for your DVOM.
     
    Chris-380 likes this.
  3. Thornton69

    Thornton69 Active Member

    463
    Sep 15, 2014
    Northern BC
    1981 245 SDC
    1984 18' Valco sled
    5.7 260 Merc/ Bravo 2
    Evanrude 115/80 jet
    Circuit breakers can fail or become weak. A bad connection would increase resistance which decreases the current. It would take a short in the circuit to prematurely trip the breaker. Is there another breaker of the same rating you can swap out to rule out the breaker?
     
    dtfeld likes this.
  4. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives
    There are two...I’ll swap next time out.

    Still trying to figure out why the dash switch blinks when CB trips...
     
  5. ttmott

    ttmott PhD in OCD GOLD Sponsor

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
    David - The two circuit breakers provide port and starboard battery voltage to the blower module which is located in the Main DC Breaker Panel Box (the yellow / red wires). The blower helm switch controls the module it does not actually operate the blowers. Additionally, the blower module is integrated with the boat's fire suppression system in that, should the halon system discharge the blowers are disabled; however, this would not cause the circuit breaker to trip. The blinking light is the blower module telling you that it has detected a fault or has faulted. The lamp in the switch is uniquely operated by the blower module (the blue wire from the module). First, I would disconnect the blower wire (yellow) from the module and see if the breaker still trips and the light still blinks; this would indicate a problem with the circuit breaker or wiring between the breaker and blower module. I believe you will find your owner's manual very descriptive on the wiring. Tom
     
    Last edited: Dec 15, 2019
    dtfeld and techmitch like this.
  6. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    Axiom 12 MFD
    Cat 3126 V-Drives
    Going to have to dig that out...never realized there was that much to it.

    Now I’m just hoping for cheap parts swap!
     

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