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B & G Sonic Speed, power supply polarity

Discussion in 'Boat Electronics' started by Moonshadow, Oct 8, 2009.

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  1. Moonshadow

    Moonshadow Guest

    The power supply terminals in the control box of this unit are marked
    "BR 10" and "BL 9".

    Can anyone tell me which of these is the positive terminal please.
    The Owners Manual is mute on this point.
     
  2. Moonshadow

    Moonshadow Guest

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