Alternator Issue..

Discussion in 'Electrical Stuff' started by Katemma Life, Apr 8, 2020.

  1. Katemma Life

    Katemma Life Member

    104
    Oct 7, 2018
    cape cod
    2007 sea ray 290 SLX
    Twin mercruiser MAG 350 MPI w/ Bravo III
    Hi,
    I accidentally spilled saltaway solution onto one of the alternators last fall when I was filling the block. It spilled right through and onto the windings. It looks as though this alternator was windings that are coated and covered but my battery voltage reading is low compared to the other engine.
    Anyway, how can I run a resistance test to check if the alternator is bad or not? Here are pictures.
    alternator ID plate.jpg alternator ID plate.jpg Thanks!
     

    Attached Files:

  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    I'd be surprised if the Salt Away is the problem. It's good to spray the engine with that stuff. Test for voltage directly at the alternator - the issue could be with connections somewhere along the line to the battery or at the battery, itself... or on the way to the gauge/at the gauge.
     
  3. Wylie_Tunes

    Wylie_Tunes Active Member

    796
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    What is the voltage of each alternator measured right at that orange booted wire/terminal? Thats a start.
     
  4. Katemma Life

    Katemma Life Member

    104
    Oct 7, 2018
    cape cod
    2007 sea ray 290 SLX
    Twin mercruiser MAG 350 MPI w/ Bravo III
    ok - I will check that. Probably a dumb question but, with the engines running?
     
  5. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Hey, better to ask, right! Yes. Don't overthink this one - it works just like it does in your car.

    After checking at the alt (assuming it's good), then check directly at the battery. If that's good, stop. You're done. All is good.
     
  6. Katemma Life

    Katemma Life Member

    104
    Oct 7, 2018
    cape cod
    2007 sea ray 290 SLX
    Twin mercruiser MAG 350 MPI w/ Bravo III
    ok great
     
  7. SloBurn

    SloBurn Active Member

    820
    May 30, 2013
    Greenwood Lake, NY
    1994 270 Sundancer. 7.4L Merc. Tow with a 2006 Dodge RAM Hemi
    340 HP Merc 454 c.i.
    If you have a voltmeter, check voltage at battery with engine off, and again with engine on.
    12.5 off
    13.5-14.5 running.
    I had issue with voltage being too high and burned up a battery. Not your problem obviously.
     
  8. northern

    northern Well-Known Member

    Jan 17, 2007
    West coast Vancouver to Alaska
    380 Aft Cabin 1989 GPS and Charts by Nobeltec
    Twin 454 strait shaft
    New one may be good idea about $250
     

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