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Liberator bb460 alternator?

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  • Liberator bb460 alternator?

    I think my alternator went bad on my liberator. Ran it for about ten miles at cruising speed with my perco switch on all. I shut it down we floated for a bit went to start it back up and click click click turned the switch to 1 battery both or the other battery click click. Gotta jump. And on the ride home had to keep all the electronics off but still not running right. ALTERNATOR? And being a big block Ford 460 can I get a generic alternator? Thanks for the help.

  • #2
    And does this have an internal or external voltage regulator

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    • #3
      the alternator needs to be marine alternator

      I myself would simply find a local electrical shop that repairs/rebuilds rotating electrics. usually a diode pack and a pair of new bearings and your off and running.
      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheasheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        Yea Scotty thanks I called the local "go to" shop they didn't have one on the shelf and said the manufacturer stopped making this alternator in 2012. I found remans online for like $300 ish. The area rebuild shop said no more $125. So guess its on to a rebuilt one.

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        • #5
          It's pretty much a "Generic"....... I still have the alternator that came off my former 460. It will work on my Mercruiser. And the regulator is internal. Your best bet would still be to get it rebuilt.
          1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
          Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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          • #6
            Having trouble loading pic but I have the late Motorola/prestolite alternator there were 4 wires hooked up to it but there's no ground going to the ground screw should there

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            • #7
              https://photos.app.goo.gl/1BgVtnxHWanYDDKx1

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              • #8
                Originally posted by 211libwtfo View Post
                Having trouble loading pic but I have the late Motorola/prestolite alternator there were 4 wires hooked up to it but there's no ground going to the ground screw should there
                Do you have the OMC (NOT Seloc or Clymer) service manual for your model? You can view the wiring diagram there....

                Most alternators in boats are grounded though the frame connections. Sometimes there's a bonding strap ...... yours grounds directly through the block ground (which makes it of the utmost importance that the ground strap is clean and tight!)
                1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
                Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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                • #9
                  I do not have the omc owners manual. So when I took the voltage regulator apart underneath the rectifier was corroded to hell. I'm hoping that was part of the problem and it was filthy. I gonna put it back on and test it in the driveway.

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                  • #10
                    So I've got 12.31dcv on the output side of my alternator. I've read it's supposed to be 14 ish but is this reading ok

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                    • #11
                      I would take the alt over to Autozone and have them test it. Their test setup will tell you if it's working correctly or not. 12.3V is not correct for a working alternator. It should be around 13.8- 14.2v when charging.

                      12V (nominal) is what you measure on a fully charged battery.
                      1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
                      Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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                      • #12
                        A good alt should put out about 14.2V. I put an Arco in my OMC about 2 years ago and it was a perfect fit.
                        1988 Four Winns 200 Horizon
                        4.3 OMC Cobra

                        98 Jeep Grand Cherokee 4.0 Selectrac
                        07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                        "While air doesn't freeze....rust never sleeps"

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                        • #13
                          I thought I'd get away with dismantling it cleaning and putting it back in but it probably needs a diode pak or something. But for the wife's trust factor I'm going to put a new one in. $125 at the local rebuild shop.

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                          • #14
                            Soo I've put a new alternator in and I believe the old one was wired improperly. Cause when I got the new one it had a purple wire, looking from the back, on the left and a red wire on the right. The old alternator was wired in reverse. After I hooked everything up we took the liberator for a ride it ran great the trim tabs worked better than ever the gas gauge worked the tach was more accurate best $125 spent in awhile.

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                            • #15
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                              Originally posted by 211libwtfo View Post
                              Soo I've put a new alternator in and I believe the old one was wired improperly. Cause when I got the new one it had a purple wire, looking from the back, on the left and a red wire on the right. The old alternator was wired in reverse. After I hooked everything up we took the liberator for a ride it ran great the trim tabs worked better than ever the gas gauge worked the tach was more accurate best $125 spent in awhile.
                              Did you ever post a pic of your boat? We all (of course) want to see!!

                              Good job! None of this stuff is very hard is it?


                              1987 FourWinns 211 Liberator, Originally an OMC 460 King Cobra.
                              Re-powered in 2006 with a 1997 Mercruiser 7.4L Bravo III

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