Motorola Alternator Question...?
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Motorola Alternator Question...?

  1. #1
    Super Moderator HammerDown's Avatar
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    Default Motorola Alternator Question...?

    Motorola Automotive Products
    Modle# MR12N451D 12V 37-AMP
    2 wire hook-up
    In order to get this tested Pep Boys needs to know what type and year car this came off of.
    I told them a 1983 Daytona Eliminator

    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Thats funny, I checked an altenator at the local autozone for a friend, older prestolite. Asking for an oil filter or plugs can be a challenge as well. I need a filter for a gen V bowtie chev big block, then I have to remember what yrs gen V were available.

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    Senior Member 77charger's Avatar
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    Good luck if it aint in their computer they dont know anything and are of no help
    whatsoever.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by 77charger View Post
    Good luck if it aint in their computer they dont know anything and are of no help
    whatsoever.
    This I know...that's why I'm asking here, about what year and what make automobile would the above Alt had been on?

    First time ever it's not putting out...like a $100 hooker that won't take a five spot
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    Senior Member Oldsquirt's Avatar
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    I want to say AMC used them, but that was such a long time ago, I cant be absolutely certain. If it turns out to be toast, I bet a nice GM based marine one-wire would be a pretty close fit.

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    Senior Member Chris The Plumber's Avatar
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    Default Alternator

    the orange wire that looks like a phone cord is called the trigger wire, it needs to see some kind of draw on it to excite the voltage regulator otherwise it wont charge, the other post on the alt. would be tied to the Batt. Positive side, the alt. doesn't need a ground the body of the alt. serves as ground, I worked in auto parts years ago & that is how we did them, todays parts stores have pre made connectors that they plug into the alt. back in the day the machine I used had alligator clips all you had to know is which is hot, which is FLD, & which is grnd. Good luck
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    not sure but if they test it WTF it matter what it came from all that matters is it works or not ????????????

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    Senior Member Futs's Avatar
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    Quote Originally Posted by 1hotboat View Post
    not sure but if they test it WTF it matter what it came from all that matters is it works or not ????????????
    Becuase they are to stupid to know how to hook it up to the test machine.The new testers are all computerized and needs cables hooked to it for the machine to put a load to it. I took mine in to get tested (little mini alt) and I ended up hooking it up for the guy. He said, is that were that wire goes? I said Yep and ran the test. tested good and walked out.

    You could always go to the local starter/alternator rebuilder. I like the old school testers anyways...

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    i saw some nice 1 wire chrome mini alt 50amps on ebay for 110, and some regular sized 70amp 1 wire chrome alts for 60bucks, that's hard to beat. i used 1 of the regular sized chrome 70amp alts on my gullwing and it actually put out 76amps and would charge at 14.8-15.6volts, worked great

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member Chris The Plumber's Avatar
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    Default Alt.

    Find a place that does specialty electrical work, like re-wiring etc. we have a place here called Elliots Auto Electric & they can check older stuff.
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    Super Moderator HammerDown's Avatar
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    Thanks for the feedback fellas...all good info
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    Hey Hammer,

    Any luck yet? I'm trying to do some research for you. I'll let you know if I come up with anything. Give me a few minutes.
    21' Commander
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  15. #13
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by alamojimmy View Post
    Hey Hammer,

    Any luck yet? I'm trying to do some research for you. I'll let you know if I come up with anything. Give me a few minutes.
    Nahhh, I'm just looking outside at another mother-F'ing rainy day and my Daytona under a wet, silver tarp.
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    Junior Member alamojimmy's Avatar
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    Everything I am coming up with suggests your alternator was only put on boats. I know the frustration of them asking "what car is it off of?" They don't have the equipment to just "hook it up" with out knowing what type of (which little numbered) connector to use on their machine. If you can talk to the actual manager of the store, usually those guys can figure out what they need to test it. Otherwise, you might have to go to a place with an old school tester. Basically other than an Autozone or Advanced or anyplace like that. The guys that are 18 that work behind the counter at these places are just not going to know how to improvise enough to make the tester work for your alternator. Hope this helps and I apologize for the rambling. Good Luck.

    Jimmy
    21' Commander
    Stock (for now) 502
    Berkeley Jet with elec diverter

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