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  1. #1
    Join Date
    May 2019
    Posts
    1

    Default Exciting alternator problem

    Not as exciting as the title suggests but I have a problem activating the alternators on a boat I'm skippering. Ignition on, battery lamp on, two exciter wires to -side of lamp but even with revs they won't wake up. I can wake them up by touching a wire from my starter+ to the exciters and they both come straight on but it's getting a little tiresome remembering to go down after starting the engine. It was working previously also. Have changed connectors at both ends of lamp to exciters and I have 0.32A current. Have tried with a 15w bulb in series to the panel lamp and it won't light up suggesting not enough potential difference but my diodes (1 for each alternator) flash on for a split second.
    I'm running out of ideas now so open to suggestions.

  2. #2
    Join Date
    Nov 2013
    Location
    Perth WA
    Posts
    1,862

    Default Re: Exciting alternator problem

    Sorry I can't help you but I am about to wire up my alternator for the first time so I am trying to familiarze myself in case of problems. Are any of these links helpful?

    https://www.google.com.au/search?sou...30.8_zIUvhtgu0

  3. #3
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,655

    Default Re: Exciting alternator problem

    I changed an alternator bulb recently for an LED equivalent and that didn't work because the current generated by the LED was too low.

    It sounds as if you have the same problem with too low a current passing through the exciter circuit. Perhaps it could be a poor connection or perhaps worn slip rings/brushes on the alternator itself?

    Richard

  4. #4
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,216

    Default Re: Exciting alternator problem

    Quote Originally Posted by RichardS View Post
    I changed an alternator bulb recently for an LED equivalent and that didn't work because the current generated by the LED was too low.

    It sounds as if you have the same problem with too low a current passing through the exciter circuit. Perhaps it could be a poor connection or perhaps worn slip rings/brushes on the alternator itself?

    Richard
    A 50 ohm resistor in parallel with the LED will probably do the trick .

  5. #5
    Join Date
    Oct 2014
    Location
    Australia
    Posts
    196

    Default Re: Exciting alternator problem

    The brushes may be worn down and touching the rings only lightly/intermittently. They are not too expensive but can a bitch of a job to change on some alternators...

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