Forums General Discussion Motorola alternator 12SA106

This topic contains 13 replies, has 9 voices, and was last updated by  petedd 6 years, 11 months ago.

  • Author
    Posts
  • #68622

    Seawater
    Participant

    Does anybody have an old motorola alternator from the early W60 equipped 424s? This was a big 120 amp alternator that may have been a high capacity option.

    The smoke just got out of mine, and we all know that electronics don’t work once the smoke gets out.

    I do have a rebuilt spare to keep me going, but I would like to get another to rebuild and put on the shelf. It si not clear yet whether mine can be rebuilt economically.

    Walter.

    BTW, the new Haarstick jib is propelling me upwind at much higher angles, at greater speed,and with less heel. I may have to install some more track to keep her tuned just so when hard on the wind, but well worth it.

  • #78803

    unabated
    Participant

    Walter nice to see you’re happy with the Haarstick sail I’ve been very happy with mine all of these years and I think I’ve owned about six or seven of them on different boats good luck Alan

    Sent from my iPhone

    On Sep 24, 2012, at 12:32 PM, “Seawater” wrote:

    Does anybody have an old motorola alternator from the early W60 equipped 424s? This was a big 120 amp alternator that may have been a high capacity option.

    The smoke just got out of mine, and we all know that electronics don’t work once the smoke gets out.

    I do have a rebuilt spare to keep me going, but I would like to get another to rebuild and put on the shelf. It si not clear yet whether mine can be rebuilt economically.

    Walter.

    BTW, the new Haarstick jib is propelling me upwind at much higher angles, at greater speed,and with less heel. I may have to install some more track to keep her tuned just so when hard on the wind, but well worth it.


    Walter
    SV Madness
    P424 Hull #1

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    Post generated from Pearson424 Forum using Mail2Forum

  • #78804

    RichCarter
    Participant

    Walter,
    I had the same unit on my old W60. I brought it to a local shop and had them service it. This place rebuilds alternators and starters. He said it was a generic truck alternator and not a particularly good one. Here’s his contact information. You might find a similar shop in your local area.

    Deco
    (603) 882-8186
    278 Derry Rd, Litchfield, NH 03052

    I eventually had him replace the old unit with a better truck alternator. He matched the mounting geometry so that I could swap-in the new unit. As I recall, he had to drill-out the mounting hole from 3/8″ to 7/16″ to fit but otherwise the replacement dropped in. I think I paid under $200 for the replacement. Though he could probably fix your broken alternator, you might consider calling him and asking for a similar replacement and put your working alternator in the spares box. The only thing that you might want to consider is the size of the replacement you pick. The replacement he made for me is much larger than the motorola unit. This means that its hard on the belts. If my batteries are low, it can blow a fuse in the regulator because the alternator can pull more field current than my regulator can handle. You might want to stick to something in the 120A size.

    Regards
    Rich


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

  • #78805

    Hull152_Patrick
    Spectator

    Going to second the rebuild. They are very serviceable.

    -p

    s/v Deep Playa | Pearson 424 Hull #152 | http://www.DeepPlaya.com |
    @DeepPlaya |
    W7PEA

    On Mon, Sep 24, 2012 at 12:55 PM, wrote:

    Quote:
    Walter,
    I had the same unit on my old W60. I brought it to a local shop and had
    them service it. This place rebuilds alternators and starters. He said it
    was a generic truck alternator and not a particularly good one. Here’s his
    contact information. You might find a similar shop in your local area.

    Deco
    (603) 882-8186
    278 Derry Rd, Litchfield, NH 03052

    I eventually had him replace the old unit with a better truck alternator.
    He matched the mounting geometry so that I could swap-in the new unit. As
    I recall, he had to drill-out the mounting hole from 3/8″ to 7/16″ to fit
    but otherwise the replacement dropped in. I think I paid under $200 for
    the replacement. Though he could probably fix your broken alternator, you
    might consider calling him and asking for a similar replacement and put
    your working alternator in the spares box. The only thing that you might
    want to consider is the size of the replacement you pick. The replacement
    he made for me is much larger than the motorola unit. This means that its
    hard on the belts. If my batteries are low, it can blow a fuse in the
    regulator because the alternator can pull more field current than my
    regulator can handle. You might want to stick to something in the 120A
    size.

    Regards
    Rich


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

    Owners no more...
    Thanks Dawn and Patrick!

  • #78806

    sumocean
    Participant

    Walter

    I have one left over after my repower. Let me know if you want it. It was
    tested about six months prior to being taken out of service that was about
    two years ago and has been in my shop since then.

    Linus


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

  • #78807

    Chuck Ruble
    Participant

    I have two of the motorola units. I think they are externally regulated. Not sure if I still have the regulator.

    Chuck

  • #78808

    madsailor
    Moderator

    Are you looking to get rid of one? Will it fit a w58 do you think?

    Bob

    I’m not being terse. This is from my mobile.
    On Sep 27, 2012 6:44 AM, “Chuck Ruble” wrote:

    I have two of the motorola units. I think they are externally regulated.
    Not sure if I still have the regulator.

    Chuck

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    Post generated from Pearson424 Forum using Mail2Forum

  • #78810

    Chuck Ruble
    Participant

    Bob, let me verify they are still in the shed.
    You sure that is the route you want to go? They are enormous and only produce about 60 amps (in a perfect world). You could get something off the shelf much smaller with internal regulation that would probably give you years of service.

    Chuck

  • #78811

    madsailor
    Moderator

    Nope, not sure. Only 60 amps? I have a delving doing 65.

    I guess my answer is never mind. Thanks for the info. Much appreciated.

    Bob

    I’m not being terse. This is from my mobile.
    On Sep 27, 2012 8:18 AM, “Chuck Ruble” wrote:

    Bob, let me verify they are still in the shed.
    You sure that is the route you want to go? They are enormous and only
    produce about 60 amps (in a perfect world). You could get something off
    the shelf much smaller with internal regulation that would probably give
    you years of service.

    Chuck

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    _______________________________________________
    maillist mailing list

    http://pearson424.org/mailman/listinfo/maillist_pearson424.org

    Post generated from Pearson424 Forum using Mail2Forum

  • #78836

    Adam Silverstein
    Participant

    I have the same motor, same alternator. $180 for a total rebuild in Brooklyn. Bearings, brushes, posts, etc., etc., and a crappy silver paint job. Guy looked like a Chinese LeChiffre.

  • #78848

    Seawater
    Participant

    Linus is sending me his old one to have tested or rebuilt.

    Chuck, why do you say they produce only 60 amps? The rating on mine is 120 amps. I have never seen it produce more than about 75 amps, but I figured that was all my battery bank was capable of accepting.

    I always assumed that if I replaced it with a newer 120 amp alternator, I would have about the same charging rate, but it sounds like you have had experience that would contradict my guess.

    The two rebuilders I spoke to said the old unit was superior to the newer smaller units of similar rating; but then they stand to make no profit if I bought new.

    W

  • #78850

    RichCarter
    Participant

    The W60 came with two possible alternators, the stock 60A unit and an optional 120A unit. Perhaps Chuck was referring to the 60A unit? As I recall, the 120A unit I had put out about 120A until the batteries came up to 14.2v. The alternator eventually went bad and was replaced. I think it overheated.

    Rich


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

  • #78851

    sumocean
    Participant

    The voltage regulator had gone bad and I took the alternator to the shop here for testing. When they bench tested it dragged the motor that powered the tester down before reaching 120. The young guy working there said it must be bad. The old guy said it was too powerful for the equipment. They normally didn’t test alternators that big. I think the old guy was right. After the new voltage regulator was installed it worked great.
    I included the regulator with the alternator. It is just a standard automotive type. Hope you get it soon
    UPS tracking 1z608w660301543015

    Linus

    On a good day I can see the other side of the river!

    On Oct 5, 2012, at 9:47 AM, wrote:

    Quote:
    The W60 came with two possible alternators, the stock 60A unit and an optional 120A unit. Perhaps Chuck was referring to the 60A unit? As I recall, the 120A unit I had put out about 120A until the batteries came up to 14.2v. The alternator eventually went bad and was replaced. I think it overheated.

    Rich


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

  • #78852

    petedd
    Participant

    The young guy needs a bit of basic electrical/physics knowledge. The
    oldtimer was right.

    The Motorola alternators are work horses that are easy and in expensive
    to repair. They can also be converted to higher output units by
    changing the windings. That is what the Ample Power folks do to make
    their great alternators.

    Pete

    On 10/5/2012 8:23 AM, Linus Martinez wrote:

    Quote:
    The voltage regulator had gone bad and I took the alternator to the shop here for testing. When they bench tested it dragged the motor that powered the tester down before reaching 120. The young guy working there said it must be bad. The old guy said it was too powerful for the equipment. They normally didn’t test alternators that big. I think the old guy was right. After the new voltage regulator was installed it worked great.
    I included the regulator with the alternator. It is just a standard automotive type. Hope you get it soon
    UPS tracking 1z608w660301543015

    Linus

    On a good day I can see the other side of the river!

    On Oct 5, 2012, at 9:47 AM, wrote:

    Quote:
    The W60 came with two possible alternators, the stock 60A unit and an optional 120A unit. Perhaps Chuck was referring to the 60A unit? As I recall, the 120A unit I had put out about 120A until the batteries came up to 14.2v. The alternator eventually went bad and was replaced. I think it overheated.

    Rich


    Original Message


    Post generated from Pearson424 Forum using Mail2Forum

You must be logged in to reply to this topic.