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Thread: Need alternator help.......

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  1. #1
    Baja Supporter rippinr's Avatar
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    Need alternator help.......

    Have a 2000 212 Islander with the 7.4mpi. Gauge always shows around 11 volts but batteries show 12-12.5 Batteries are on Perko switch and all that seems fine. I started getting warning light on gauge when it drops to 10-10.5 volts so I started worrying it wasn't charging. I've never had dead batteries they just didn't seem to be charging. When I put meter on them and start engine volts drop a few tenths instead of 13 or so like they are charging. Alternator measured 25 volts at its terminals so I thought it was bad and installed a brand new one. Same exact thing. It shows 25 volts at its terminals and batteries do not go up in voltage like they are charging. I guess alternator was not bad. What could it be? I'm stumped. Voltage regulator?

  2. #2
    Baja Supporter JerseyOutlaw's Avatar
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    Re: Need alternator help.......

    Quote Originally Posted by rippinr View Post
    Have a 2000 212 Islander with the 7.4mpi. Gauge always shows around 11 volts but batteries show 12-12.5 Batteries are on Perko switch and all that seems fine. I started getting warning light on gauge when it drops to 10-10.5 volts so I started worrying it wasn't charging. I've never had dead batteries they just didn't seem to be charging. When I put meter on them and start engine volts drop a few tenths instead of 13 or so like they are charging. Alternator measured 25 volts at its terminals so I thought it was bad and installed a brand new one. Same exact thing. It shows 25 volts at its terminals and batteries do not go up in voltage like they are charging. I guess alternator was not bad. What could it be? I'm stumped. Voltage regulator?
    Sounds like a bad gnd

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  3. #3
    Baja Supporter SEA-NYLE's Avatar
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    Re: Need alternator help.......

    Have a look at all major power and ground points. Start at the battery terminals and work your way to the Perko switch. As mentioned, check and clean the main ground at the back of the engine/bell housing. Good place to start...


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    Baja Supporter tablerocker's Avatar
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    Re: Need alternator help.......

    Alternator shows 25 AMPS or 25 VOLTS across the terminals? It should show around 14.5 volts, and depending on idle speed and how the alternator is wired, 25 - 35 AMPS at idle. This CURRENT (amperage) will go up significantly as engine RPM is increased, remember these alternators are typically 100 - 130 AMPS...
    Table Rock Lake is my home away from home, and big block power rules.

  5. #5
    Baja Supporter rippinr's Avatar
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    Re: Need alternator help.......

    Quote Originally Posted by tablerocker View Post
    Alternator shows 25 AMPS or 25 VOLTS across the terminals? It should show around 14.5 volts, and depending on idle speed and how the alternator is wired, 25 - 35 AMPS at idle. This CURRENT (amperage) will go up significantly as engine RPM is increased, remember these alternators are typically 100 - 130 AMPS...

    Alternator measures 25 Volts at its terminals. Weird

  6. #6
    Baja Supporter tablerocker's Avatar
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    Re: Need alternator help.......

    yeah...real weird.
    never seen THAT!
    Table Rock Lake is my home away from home, and big block power rules.

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    Charter Member #6 Anchorman's Avatar
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    Re: Need alternator help.......

    Quote Originally Posted by rippinr View Post
    Alternator measures 25 Volts at its terminals. Weird
    theres not a chance you have your batteries hooked up wrong and pushing 24Volts is there?
    Because without beer things just dont seem to go as well

  8. The Following 2 Users Say Thank You to Anchorman For This Useful Post:

    JerseyOutlaw (07-19-2018), tablerocker (07-18-2018)

  9. #8
    Baja Supporter stude's Avatar
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    Re: Need alternator help.......

    Ever figure out what the problem was


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  10. #9
    Baja Supporter rippinr's Avatar
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    Re: Need alternator help.......

    Quote Originally Posted by stude View Post
    Ever figure out what the problem was


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    Still haven't figured it out. Everything looks ok. I just can't force myself to check all the cabling on starter. Its hell to get to. I just charge my batteries before each time I go out. At the end of day they end up at about 12 volts. Gauge shows still around 10-11 volts. Boat starts and runs fine. I can float and run stereo all day and it still fires right up. Alternator still measuring high at its terminals. I'll worry about it in off season I suppose.

  11. #10
    Baja Supporter JerseyOutlaw's Avatar
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    Re: Need alternator help.......

    Quote Originally Posted by rippinr View Post
    Still haven't figured it out. Everything looks ok. I just can't force myself to check all the cabling on starter. Its hell to get to.
    I just did a starter on my 525 2 weeks ago. I had to pull the exhaust off that side of the motor. When I had the 496 I was able to do the starter without pulling the exhaust.

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