115 Volt AC Circuit Not Working

Discussion in 'Electronics Q&A' started by Skip ThunderBolt, Nov 22, 2022.

  1. Skip ThunderBolt

    Skip ThunderBolt New Member

    10
    Nov 16, 2022
    Louisville KY
    390 Sea Ray
    2 454 Mercruiser

    Attached Files:

  2. Saverio

    Saverio Well-Known Member GOLD Sponsor

    Aug 31, 2010
    Patchogue, Great Southbay N.Y.
    1995 450 DA
    Cat 3126 420hp
    900 hours Westerbeek Generator
    do you have a volt meter? check for voltage at the other side of the cord, they do go bad. next is to check at the shore power receptacle on the boat. check if its lose or blackened
     
  3. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Sometimes on these older (but goody!) boats it's a bit like you're in some far off, lost land ;)

    Did you ever have power?

    Does your boat use a master breaker near where the shore power plugs in?

    I'm not sure what you mean by "shore power is on", but check the breaker at the shore power pedestal and if good, check for voltage at the boat end of the cable.
     
  4. Golfman25

    Golfman25 Well-Known Member

    Sep 12, 2009
    IL
    1998 370 Sundancer
    7.4 MPI
    Yep just have to trace it to find the fault. Good luck.
     
  5. SKybolt

    SKybolt Well-Known Member SILVER Sponsor

    Nov 11, 2014
    Kent Narrows, MD
    460 EC
    Detroit 6v92TA
    (Low profile's)
    Alison Gears
    Westerbeke
    12.5kw Genset
    @Skip ThunderBolt I am guessing your boat is late 80's? Is the power still on the side of the boat or was it moved? If it is, there are no breakers between that and the panel. You need to open the panel and measure the voltage coming in to the main breakers on the panel and go from there.

    I will ask what is the gold glass fuse you have pictured? That is not original and not by Sea Ray. Are you twin 30's or a single 50?
     
    techmitch likes this.
  6. DWABoat

    DWABoat Well-Known Member SILVER Sponsor

    986
    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    Don’t assume because that crappy needle is not moving you do not have voltage. Check all wires with a quality meter first before bare-handing them. The one on my 2001 sporadically works.
     
    Nater Potater likes this.
  7. Skip ThunderBolt

    Skip ThunderBolt New Member

    10
    Nov 16, 2022
    Louisville KY
    390 Sea Ray
    2 454 Mercruiser
    twin 30 amp coming in. Thanks
     
  8. km1125

    km1125 Well-Known Member

    380
    May 5, 2021
    470
    Cummins QSB6.7
    I doubt that glass fuse has anything to do with it. Looks more like someone added that as part of a stereo system.

    What position should that generator transfer switch be in for shore power? Looks like it's in "1+2" mode, which I think feeds both your AC inputs from the generator.
     
  9. techmitch

    techmitch Well-Known Member PLATINUM Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    1&2 should feed from shore power lines 1 & 2, switch to "Gen" position 2 o'clock, for power from the generator. No?
    upload_2022-11-26_12-51-58.jpeg
     
  10. km1125

    km1125 Well-Known Member

    380
    May 5, 2021
    470
    Cummins QSB6.7
    Not sure. I'm not sure how those switches are configured, so that's why I threw it out there. Seems like that switch is between the voltmeters and the shore power, so it could be having a problem (bad contacts? loose wire?) or just be in the wrong configuration/position.
     
  11. SKybolt

    SKybolt Well-Known Member SILVER Sponsor

    Nov 11, 2014
    Kent Narrows, MD
    460 EC
    Detroit 6v92TA
    (Low profile's)
    Alison Gears
    Westerbeke
    12.5kw Genset
    The rotary switches have multiple configurations. And going from pin to pin isn't going to help out. The only way to t-shoot this is to see that power is coming in to the panel/switch, then trace back from the panel to the switch. There is a good possibility that the switch is burned out internally. Blue Sea Systems makes newer versions of these switches, but I doubt with the same pin out.
     

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