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caterpillar 3412 TA GP SP sensor cables

Discussion in 'Engines' started by zappiros, Oct 29, 2013.

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  1. zappiros, Oct 29, 2013
    #1
    zappiros

    zappiros New Member

    Joined:
    Nov 6, 2008
    Messages:
    57
    Location:
    Bonaire, South America
    hello to all, I have a pair of 3412TA CATS marine engines on my boat and recently needed to change the GP SP Speed sensors 2 on each engine, one is the main and one for back up...now the problem I am habing is because new GP SP 1060543 sensor only came with two wires and this new sensor replaces both old sensors... now.....old sensors had three wires? so I do not know wich wire should I use and wich wire should I left unused .???? anyone have gone thru this already? many thanks for all the help, !!!!
  2. Capt Ralph, Oct 30, 2013
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,726
    Location:
    Satsuma, FL
    So, you know you have new sensors and not the wrong ones. I guess somebody told you they were new and not where the third wire goes.
    It's probably just a drain or ground. You should have two wires numbered and matching numbered wires on the harness.

    Seems there may have been some sensor changes after serial number
    1EZ3925 But I can not find any details.

    You may want to contact Cat Tech directly. Maybe one of the kids her on YF has a schematic.