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  1. #1
    Join Date
    Mar 2009
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    Feock
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    Default how do i test rectifier, diode , regulator on alternator.

    Hiw do i test my alternator rectifier, diode , regulator?

    I'm not an electronics wizz so simple terms please.

    I can use a multimeter.

    I dont want to keep starting engine as it will drain my rapidly diminishing starter battery.

  2. #2
    Join Date
    Oct 2006
    Location
    - up to my neck in it.
    Posts
    26,582

    Default

    I take mine off & got to an auto-electrician, they can check it in seconds & can do the repair - often while you wait. And you only pay car prices, not marine ones. Test will probably cost about 20 quid tho & repair another 30 ish.
    Boaty junk clogging up your shed or lockers? Chuck it in http://groups.yahoo.com/group/Marinaskip

    Want a used bike, spares or repairs in Staffordshire? Visit http://back2bikes.org.uk/

  3. #3
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    16,829

    Default

    There's a book on free download called 'The 12 V doctor's alternator book' by Edgar Beyn. If you can't find it PM me your e-mail address and I'll send it.
    Answers to some technical queries at http://coxengineering.sharepoint.com

  4. #4
    Join Date
    Mar 2009
    Location
    Feock
    Posts
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    Default

    Thats the obvious solution searush, but im on the boat holed up away from home harbour and car, its a sunday, and if i can find the problem today i may just be able to find a way to bodge fix it so i have enough juice in my batteries for a solo run home tomorrow with my beloved autopilot doing the hard work.

    So, does anyone know how to test these? What resistances should i look for with the rectifier? Etc...

  5. #5
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    33,783

    Default

    Quote Originally Posted by reddragon2 View Post
    Thats the obvious solution searush, but im on the boat holed up away from home harbour and car, its a sunday, and if i can find the problem today i may just be able to find a way to bodge fix it so i have enough juice in my batteries for a solo run home tomorrow with my beloved autopilot doing the hard work.

    So, does anyone know how to test these? What resistances should i look for with the rectifier? Etc...
    You have two threads running on the same topic.
    I have just posted details of how to test the rectifier on the other thread
    http://www.ybw.com/forums/showthread...33#post2995133
    Last edited by VicS; 12-06-11 at 10:44.
    Sea Wych Owners Association: www.Seawych.org

  6. #6
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    33,783

    Default

    Quote Originally Posted by vyv_cox View Post
    There's a book on free download called 'The 12 V doctor's alternator book' by Edgar Beyn. If you can't find it PM me your e-mail address and I'll send it.
    It can be found http://www.motoren.ath.cx//Download....orhandbook.pdf
    Sea Wych Owners Association: www.Seawych.org

  7. #7
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    16,829

    Default

    Quote Originally Posted by VicS View Post
    I have that link too, but can't get it to work. I tried it several times yesterday and once today. After entering the code nothing happens. Anyone else finding the same?
    Answers to some technical queries at http://coxengineering.sharepoint.com

  8. #8
    Join Date
    Oct 2005
    Location
    Durham, England
    Posts
    12,106

    Default

    Link works for me. Take care over 0/O.
    Thick as two short planks

  9. #9
    Join Date
    Jun 2005
    Posts
    14,518

    Default

    I've repaired a handful of alternators for myself when I needed to. I can tell you that it's impossible to test the diodes without removing the diode array, you need a large soldering iron (usually). Most common issues are bad wiring./connections to and from alternator and battery (remember the negative connection to engine (usually), battery defects are common too. You can remove the regulator as a desperate gambit but you have to ensure that you don't overcharge your battery.
    If I'd wanted to live in a Banana Republic I'd have gone to South America.

  10. #10
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    33,783

    Default

    Yep works for me too.

    But wiggling the wires will probably sort it out
    Last edited by VicS; 12-06-11 at 10:57.
    Sea Wych Owners Association: www.Seawych.org

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