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MercurySierraCDI
Results 1 to 9 of 9
  1. #1
    Join Date
    Jun 2008
    Location
    Waretown, NJ, USA
    Posts
    4

    Default "Hi all. I have a 90HP 2cy ser

    "Hi all. I have a 90HP 2cy serial 0T734284 that does not seem to be charging. The battery voltage is 12.8 when the engine is not running. When the engine is running, the voltage does not change. The manual says the voltage should increase to around 14.5. Coincidentally, the tachometer no longer works and moves erratically on the dial.
    (Not sure if the two problems occurred at the same time.)
    I'm thinking I need a new regulator and a new tachometer.
    What do you think?

    Thank you!

    Jim"

  2. #2
    Join Date
    May 2009
    Location
    Marine Engine
    Posts
    564

    Default it sounds like your stater has

    it sounds like your stater has failed I have attached a link below for anew one.
    http://www.marineengine.com/newparts...ne=&Model=

  3. #3
    Join Date
    Jan 2009
    Location
    blanchard, ok, usa
    Posts
    76

    Default Sounds like the volt/rec went

    Sounds like the volt/rec went out... what year ????
    arcrat

  4. #4
    Join Date
    May 2009
    Location
    Marine Engine
    Posts
    564

    Default remember the stator runs the e

    remember the stator runs the electric pulse for the tach

  5. #5
    Join Date
    Jun 2008
    Location
    Waretown, NJ, USA
    Posts
    4

    Default Engine is a 2003. Thanks gu

    Engine is a 2003.

    Thanks guys for the responses.

    Jim

  6. #6
    Join Date
    Nov 2005
    Location
    Chesapeake, Va, US
    Posts
    1,111

    Default "Test your rectifier/regulator

    "Test your rectifier/regulator according to your manual. The problem you are describing is typical of blown diodes in the rectifier. If you have ever created a spark or connected the battery up backwards (even for a split second), you blew a diode(s)."
    Bill H PTC USN Ret
    A manual is a cheap investment.

  7. #7
    Join Date
    Sep 2006
    Location
    SF BAY AREA, CALI, USA
    Posts
    8,641

    Default got a hand held volt meter?

    got a hand held volt meter?
    HUMAN BUILT = HUMAN FIXED

    CERTIFIED MARINE TECHNICIAN

    WWW.SWITCHBAIT.COM

  8. #8
    Join Date
    Jun 2008
    Location
    Waretown, NJ, USA
    Posts
    4

    Default "Well, yesterday I replaced th

    "Well, yesterday I replaced the OE regulator with a Sierra replacement. (Courtesy of marineEngine.com)
    The good news is that the charging system is working properly now. At cruise speed, the battery is being charged at 14.5 volts.
    The tachometer is also working...sort of. Although the tach reading is now steady, it reads on the high side. At idle, it reads 1200rpm and at WOT throttle the needle pegs to 6000rpm. Not sure if I can simply recalibrate the tach or it needs to be replaced. Any ideas?

    One other thing...the Sierra replacement part only came with five connecting wires. The OE part had six. A note in the box said that a sixth wire on the Sierra was not necessary since it grounds itself through the metal housing and the motor bracket. Problem is that the motor bracket on my motor is plastic. I had to run a wire from the Sierra regulator housing to the clipped ground wire on the OE reg.

    Thanks for all previous advice.

    Appreciate it if anyone has any info on the current state of the tachometer.

    Thanks!!!"

  9. #9
    Join Date
    Nov 2005
    Location
    Chesapeake, Va, US
    Posts
    1,111

    Default Look on the back of your tach

    Look on the back of your tach and make sure it is set exacly on 6P. Close don't count.
    Bill H PTC USN Ret
    A manual is a cheap investment.

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