Click for Ocean Alexander Click for Westport Click for Delta Click for Nordhavn Click for Walker

50 Post with 820MANs

Discussion in 'Post Yacht' started by dickfold12, May 17, 2021.

You need to be registered and signed in to view this content.
  1. dickfold12

    dickfold12 New Member

    Joined:
    Jun 9, 2020
    Messages:
    5
    Location:
    usa
    Having an issue with port motor, when powering on ignition the port engine breaker blows in Salon panel, prior to blowing, I can hear lots of clicking from the 12 to 24v starting solenoid.
    Does anyone have experience with the 12 to 24v starting system?
  2. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,649
    Location:
    Satsuma, FL
    First guess, the double stacked solenoid that transfers dual (parallel) 12v batteries to series 24v starting batteries has a problem.
    Usually a bad battery.
    Can you offer a schematic and better location than USA?
    Some of us could be rite next door...
    Rerm likes this.
  3. mapism

    mapism Senior Member

    Joined:
    Aug 9, 2008
    Messages:
    2,111
    Location:
    Sardinia
    I'm not familiar with Post boats, but it sounds unusual to have 12V CC on a boat with 24V starter engines. Do they have 12V alternators?
    Anyway, if your engines are the D2840LE401 (820hp V10), they are fully mechanical, and all they need to fire up is 24V feeding the starter motor, nothing else.
    So, it would be much simpler to have 2x12V starting batteries permanently wired in series and dedicated to engines, leaving the domestic bank batteries separate (and wired at 12V, if that's what you've got).
    BTW, this is also what MAN recommends for CC electrical wiring, though that's arguably more relevant with electronic engines.
  4. dickfold12

    dickfold12 New Member

    Joined:
    Jun 9, 2020
    Messages:
    5
    Location:
    usa
    Thanks for the response, we were coming to that conclusion today and ordered a new solenoid. I don’t have a schematic, but can take some pictures tomorrow at the boat. In the engine room the aft Starboard wall has a double stack solenoid, plus another heavy duty solenoid(guessing the parallel), plus three smaller solenoids. And the aft port side has another double stack plus a single smaller solenoid.

    We are in OBX currently, if anyone knows a quality marine electrican that could possibly come out please feel free to share.

    thanks
  5. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,649
    Location:
    Satsuma, FL
  6. mapism

    mapism Senior Member

    Joined:
    Aug 9, 2008
    Messages:
    2,111
    Location:
    Sardinia
    After looking at the schematics that CR posted, if that's what you have in your boat, I would get rid of it PDQ.
  7. dickfold12

    dickfold12 New Member

    Joined:
    Jun 9, 2020
    Messages:
    5
    Location:
    usa
    Still no luck, checked solenoids, starter and alternator. have an electrician looking at the boat, must be a short somewhere but if anyone else has ideas feel free to share
  8. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,649
    Location:
    Satsuma, FL
    OBX,, Outer Banks?
  9. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,649
    Location:
    Satsuma, FL
    Lets trace all fuses and breakers.
    Fuses around the solenoids are common. MAN (pending wire harness length) has sometimes places a separate breaker box in the ER at usually a remote location.
  10. C team

    C team Senior Member

    Joined:
    Nov 1, 2011
    Messages:
    244
    Location:
    Kent Island
    Yep!