Mercathode question

Discussion in 'General Maintenance/Repair Questions' started by DWABoat, Nov 19, 2019.

  1. DWABoat

    DWABoat Member

    98
    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    I recently purchased a nicely equipped 2001 280 DA. Has twin 4.3’s, the Koehler 5E generator, A/C, water heater, Vacuflish, Microwave, “etc, etc, etc.” (Old Timers will get that Yul reference.)

    The twin Alpha Ones have anodes, but I do not see the little Mercathode current wire box under the transom assemblies. There is an anode on both. Further, there is no visible Mercathode Controller I can see in the engine room.

    I was a little surprised because I thought most Mercruisers came with that system, especially the nicely equipped ones.

    However, I see the EIM box in the engine room has both port and starboard Mercathode systems labeled.

    Finally my question: Is this some type of Impressed current system I am not familiar with OR are the boat EIMs all set up for the system as an available option?

    I am doing a Transom Assembly change this winter and will install the system, if it not there.
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Alpha drives don't have the Mercathode system as standard equipment. The labelling in the EIM is because Bravo drives were an option (standardized labelling).

    When you buy a Mercathode system (whether it's the one that replaces that anode or the "pucks" that attach to the transom), it's an all-in-one setup - the control box you get is the brains. Nothing is already built into the boat.
     
  3. DWABoat

    DWABoat Member

    98
    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    I suspected.
    I will install the system as I do the transom assembly change next month.
    Thank you.
     
  4. Captn TJ

    Captn TJ Active Member

    770
    Sep 19, 2017
    Catawba Island, Oh
    2005 280DA
    Raymarine E80
    5.0 with Bravo 3

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