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Thread: Backup Alternator

  1. #1
    Join Date
    Dec 2006
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    mahwah, NJ / Naples, Fla (Pelican Lake)
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    442

    Default Backup Alternator

    I want to carry a backup 24 volt alternator. I don't have the oil cooled large setup. Mine is a stand alone mounted next to the 12 volt alternator on the passenger side. Its a Delco Remy and doesn't have a mark on it, no model number or anything. Its 24 volt and 75 amps and has an internal regulator. I can get a new one from Prevost but I would rather get a rebuilt to carry with me. Does anyone have the Delco# or a number/source that I could use. Any help would be appreciated.
    Attached Images Attached Images
    Last edited by Jim Skiff; 10-13-2009 at 01:49 PM.
    Wendy and Rick DeSilva
    '08 Marathon H-3
    2017 F350 platinum
    Mahwah, NJ
    Brant Beach, NJ
    Pelican Lake, Fla

  2. #2
    Orren Zook Guest

    Default

    Quote Originally Posted by rickdesilva View Post
    I want to carry a backup 24 volt alternator. I don't have the oil cooled large setup. Mine is a stand alone mounted next to the 12 volt alternator on the passenger side. Its a Delco Remy and doesn't have a mark on it, no model number or anything. Its 24 volt and 75 amps and has an internal regulator. I can get a new one from Prevost but I would rather get a rebuilt to carry with me. Does anyone have the Delco# or a number/source that I could use. Any help would be appreciated.
    Without seeing your alternator, I'd guess a 21SI. Is it a pad mount (mounting bolts down each side) or J mount? There's a J mount on ebay right now for $159 you should be able to get it for less at a Federated in New Jersey: http://cgi.ebay.com/ebaymotors/DELCO...QQcmdZViewItem
    Last edited by Orren Zook; 10-13-2009 at 08:40 AM.

  3. #3
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    Jan 2006
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    Jasper
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    Default

    Rick,

    Can you get us a picture? I'll check the number on mine.

  4. #4
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    mahwah, NJ / Naples, Fla (Pelican Lake)
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    Default

    I had trouble with the attachment so Skiffer posted it for me. The alternator is Caterpillar yellow so its probably a rebuild. It has no markings on it except Delco Remy stamped into the rear plate.
    Wendy and Rick DeSilva
    '08 Marathon H-3
    2017 F350 platinum
    Mahwah, NJ
    Brant Beach, NJ
    Pelican Lake, Fla

  5. #5
    BENC Guest

    Default

    I believe if you show that picture to Dan Hartley at Parliament Parts (727-420-6805), he may have some take-offs you could purchase. They got a few shells with that installed on it, but took it off to install the Parliament OTR a/c compressor in it's place. Hope that helps.
    Last edited by BENC; 10-13-2009 at 10:26 PM.

  6. #6
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    Default

    Pilots like back-up and redundancy. At one time or another everything on my plane has failed so having another device for back-up or system redundancy has made a bad situation tolerable.

    Having said that however, consider how the coach is set up and determine if you already have back-up or alternate methods in place. For my chassis I have a charger, and for my house I have inverters, so if my single alternator pukes which it did a while back I just started my generator and was able to keep on trucking.

    If I had smaller alternators such as the one Rick shows I think if I had some form of on board charging in case it failed I would leave them home in my garage. My reasoning involves risk versus reward considerations. What bad will happen if the one on the bus fails, and do I have a way to keep going on my trip until I can buy one or get home? That line of thinking would steer me to questioning whether I had an on board substitute such as a charger or inverter that could be powered from my generator. I would also be considering the failure rate. Do alternators fail more often than belts?

    If we want to look at determining what extra parts we should carry I think the assembled masses in this asylum we call POG should mentally review what problems and failures we all have had and then consider how we could deal with them if they happened to us. Since each coach is equipped differently there is no single answer.

    Based solely on gut feel, I'll bet if we were to pick the single most common failure point on our buses we would find it is our batteries. Anybody out there carry spares? That would be followed by AC failures. I am ignoring failures of non critical items such as shades.

  7. #7
    Join Date
    Feb 2006
    Location
    Bristol, Tn
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    1,647

    Default Failures?

    Jon: My most common failure to date is a/c-alternator belts. Last year in Gillette Wy and this year in Corinth Ms. I was able to to continue on to a comfortable stopping place by running the Generator to provide the 24 volt Chassis batteries necessary power thru the guest Charger.

    I don't know that the charger could have stayed ahead of the curve if I were running at night with dash air, lights, wipers, and defrost fans going on - but daylight no rain it maintained the batteries (new ones).

    Nope, ain't hauling no spare batteries, plenty of places to buy them if needed. Kinda like fuel.
    Roger that!
    2008 Liberty DS XL2
    2023 Denali Ultimate
    My 6th Prevost

  8. #8
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    Nov 2006
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    Sugar Land, TX
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    Quote Originally Posted by rfoster View Post
    Kinda like fuel.
    Hey Roger, who were you aiming that arrow at ?

    Gary S.

  9. #9
    Join Date
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    mahwah, NJ / Naples, Fla (Pelican Lake)
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    Default

    Thanks for all the info, I'm into redundancy. I figure I'm better with spares.
    Wendy and Rick DeSilva
    '08 Marathon H-3
    2017 F350 platinum
    Mahwah, NJ
    Brant Beach, NJ
    Pelican Lake, Fla

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