GT-40 Alternator Substitution

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
  • jbach
    • Aug 2012
    • 187

    • the state, not the jelly

    • 1999 SAN
    #1

    GT-40 Alternator Substitution

    Are alternators marine specific? Are there any auto substitutions that would work well on the GT-40 platform? I noticed my battery didn't have the voltage it usually does and am suspect of the alternator. The gauge has never really shown anything over 12 when cruising, but have never had charging problems. I realize the gauges are pretty inaccurate.

    I would have ordered the 100 amp upgrade, but we're leaving for a lake trip tomorrow. Just thinking about picking something automotive up if I can, and change out if it's not charging properly. Hate to ruin a trip due to the alternator.

    If an auto won't work, are there any other marine brands that crossover that may be more readily available than the PCM?
    Tags: None
  • s_kelley2000
    1,000 Post Club Member
    • Nov 2007
    • 1575
    • Fort Meadow Recevoir

    • Mass

    • 2012 Super Air Nautique 230 1999 Nautique Super Sport with 502 Python (for Sale)
    #2
    Yes there is a big difference between auto and marine alternators and starters. Marine units are ignition protected to shield sparks from possibly igniting gas fumes. I am sure there are some other marine units that will cross over besides the PCM one but I don't know of any off hand. I would think as long as the amperage is sufficient that quite a few other ones (probably anything for a small block Ford) would work although you may have to swap out the pulley from your existing alternator. Good luck!
    Shawn

    2012 Blue Metal Flake SAN 230

    1999 Black and Tan Python 502 Powered Super Sport (for Sale)

    Comment

    • jhersey29
      • Nov 2013
      • 330

      • Colorado

      • 1971 Correct Craft Mustang 1988 Ski Nautique 1992 Ski Nautique 1999 Ski Nautique
      #3
      Why not just use the old one and minimize the electric draw? Everyone can live noise free for a few days.

      Comment

      • jbach
        • Aug 2012
        • 187

        • the state, not the jelly

        • 1999 SAN
        #4
        Originally posted by jhersey29 View Post
        Why not just use the old one and minimize the electric draw? Everyone can live noise free for a few days.
        Even without lights and sounds, that's still pretty tough with 4 jabscos to feed and a couple dozen starts. I may just bring a spare battery and charger just in case.

        Comment

        • kend
          • Oct 2013
          • 193

          • DFW, Texas

          • current 2001 Air Nautique previous 1988 Sanger DX
          #5
          Originally posted by jbach View Post
          Even without lights and sounds, that's still pretty tough with 4 jabscos to feed and a couple dozen starts. I may just bring a spare battery and charger just in case.
          I never take the boat out without a jump box, Craftsman makes one that will charge your phone, blow up floats, provide light, and reads alternator output if you hook it to your battery while the engine is running...oh and it will jump your battery.
          Ken
          2001 DD Air GT40

          Comment

          • jchamlin
            • Jun 2004
            • 171

            • Charlotte, NC

            #6
            Do you have Perfect Pass? When I push my start button to turn on the electronics, it's reading around 12 volts. Then perfect pass starts up and immediately drops. After the boat is running, assuming my batteries are fully charged, it's only at 12.5 volts at most. If you have a multimeter, I'd check the battery terminals while the boat is running to see what you're getting.

            Can you bring a battery charger on your lake trip? I guess it depends if you're camping or have dock / power access.
            2000 Air Nautique

            Comment

            Previous template Next
            Working...
            X