Northern Light trips 120v breaker

Discussion in 'Marine Electrical / Electronics' started by 2na, Nov 9, 2018.

  1. 2na

    2na Member

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    Hi folks,
    I can use some help...

    Recently, when I try to use generator 120v power, it trips the 120vac breaker. With all the secondary breakers off (AC outlets, stove etc) and the main 120v CB on, it am getting a 110v reading on the
    panel meter. But as soon as I try to turn on one of the secondary switches (AC outlets etc) to use 120v
    power, the 120vac breaker trips immediately. I have trace all of my wiring and nothing is shorted or loose. The breaker & fuse on the generator are not tripped.

    120vac breaker does not trip when I am on shore power. The breaker is an airpax 65a single switch.
    37a per shore/generator operated on a shore/off/gen switch.

    Could it be as simple as the generator pole for the generator power is bad and the shore power is okay?
    Simple enough to try; but can't find the darn thing locally.

    3 pole Breaker reads; I sp I30 I30
    65ac TA 37.5 TA37.5

    Any ideas?
     
    2na,
  2. RCLS2016

    RCLS2016 Member

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    Sounds like it could possibly be a bad breaker. Try Switches Unlimited or Wes Garde. If they have extra breakers that another boat Mfg., ordered in stock, then they will be cheap. Also take a look at the neutral connection on the generator itself
     
  3. EZ1

    EZ1 Senior Member

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    What work has been done lately? What is now plugged in that was not before? What has changed?
     
    EZ1,
  4. PBianculli

    PBianculli Member

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    I’d check the generator voltage with a different volt meter to be sure the voltage is correct.
     
  5. captjohn

    captjohn Captain

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    Need to understand a few things.

    Their is a breaker on the generator, and a breaker on the panel. Is the breaker on the panel tripping, not the breaker on the generator? Is that correct?

    If that is correct, is this happening when the boat is still plugged into shore power, and the shore power breaker is on? Or is this happening without shore power plugged in, or with the shore power breaker turned off?

    If it's happening with shore power plugged in, and the shore power breaker is on, unplug shore power, or shut the shore power breaker off, then try switching over. If the breaker does not trip, your generator switch is probably leaking voltage on one, or multiple, phases.
     
  6. 2na

    2na Member

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    Thanks. I suspect it's the breaker, but having a hard time finding a replacement
     
    2na,
  7. 2na

    2na Member

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    2na,
  8. 2na

    2na Member

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    thanks.
     
    2na,
  9. 2na

    2na Member

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    No work/changes has been made. Thanks!
     
    2na,
  10. 2na

    2na Member

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    Anyone know of a cross to an Airpax CB #UPG666-27824-1? I called Sensata and they gave me a cross #IUGF666-40661-1, but can't find that either.
     
    2na,

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