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Holding tank

Discussion in 'Ocean Yacht' started by BigChief, Oct 11, 2021.

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  1. BigChief, Oct 11, 2021
    #1
    BigChief

    BigChief Member

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    1996 48 forward holding tank under queen bed.
    The 3 indicator lights for the tank level don't work correctly. The only one that's ever lit up is the bottom 1.
    Does anybody have any experience with these systems and what kind of sending unit might be in the forward tank.
    I know I'm going to have to take the sending out but I would like to know If anyone else has done this before.
  2. Capt Ralph, Oct 11, 2021
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    The little floats get stuck most times. The assembly unscrew and up. Have a bucket or pail ready to receive the assembly. Pending tank depth, it could be tall.
    Magnets in the floats open / close lil Reed switches.
  3. Capt Ralph, Oct 11, 2021
    #3
    Capt Ralph

    Capt Ralph Senior Member

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    If the floats are clear, ohm out the switch. The float / switch kit is available from Dometic.
  4. Capt Ralph, Oct 11, 2021
    #4
    Capt Ralph

    Capt Ralph Senior Member

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    I splice in a trailer flat connector to make removing the assembly easier.
  5. 45SS, Oct 11, 2021
    #5
    45SS

    45SS Member

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    If it's the same type of sender that my 1997 45 had it doesn't have any floats. I believe it's some type of capacitance set up. On mine the connectors and were corroded beyond repair. I replaced the whole setup with a system from Tech-Edge. Used the existing wiring and the sending unit screwed right in to the existing bung in the tank. Been working good for three years now.
  6. TahoeJohn, Oct 13, 2021
    #6
    TahoeJohn

    TahoeJohn Member

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    Another option (if you're considering a full replacement) is from SCAD. I replaced both my holding and fresh water tank sensors with a TM2 - works great.

    https://www.scadtech.com/tank_monitors
  7. BigChief, Oct 13, 2021
    #7
    BigChief

    BigChief Member

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    Ok thanks I will look I to that before I open or remove what I have.

    Do you have the fiberglass tank shaped like a V under the forward berth?
  8. 45SS, Oct 13, 2021
    #8
    45SS

    45SS Member

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    I have a rectangular shaped tank on centerline under master/forward berth.
  9. Capt J, Oct 13, 2021
    #9
    Capt J

    Capt J Senior Member

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    Yeah, if it's the dometic one it's easy.......they press in, but you have to carefully cut the tubing to fit (use a tubing cutter) and make them the right length. They sell them in the different lengths.