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Running two alternators **UPDATE**

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by newyorkin, Aug 21, 2001.

  1. newyorkin

    newyorkin 1 ton status

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    Electrical guys, I need some help/opinions!!

    I have a good alternator from a '92 park avenue. I'm assuming it's pretty high output, since the fuses in the car were all 40-70 amp.
    1st half:
    Does anyone know what I have to do to bench test this thing? I can rotate it with a drill, but how do I place it in a circuit for see it's output?
    2nd half:
    I'm not looking to replace my K5' alternator with this one, but I'm wondering if I can add this one to the truck as a second unit temporarily, and how I'd need to isolate the circuits, etc.
    I'm running 8 off-road lamps (not simultaneously), 1 AC compressor, a 400 watt amp, CB, 700 watt power invertor, 1 auxiliary electric cooling fan. Right now, I see serious load on my stock alt just running the AC, stereo, and bright headlights simultaneously, worse in rainy weather.

    We're leaving for PA around 9pm tonight, then Niagara falls on thursday, and I'd like to get more amperage in by thursday.
    I don't have the time or immediately the budget to just get a higher amp alt. to replace the existing, even though I know that's the better route. I have everything I need to mount this thing on the engine and get a drive belt on it already.

    Any help would be really appreciated!!

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**
     
  2. LittlePig

    LittlePig 1/2 ton status

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    Re: Running two alternators

    Most places like Autozone and Pep Boys have a test bench to check alternators. Their test bench should be able to give a readout on amp output.

    Email: littlepig@keepandbeararms.com
    ICQ: 84108805
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    Re: Running two alternators

    Most any auto parts store can bench test the output for you.

    I would still go with ONE killer alternator that should, and will keep up with your real time needs. What I mean by that is you aren't going to be running everything at once (I hope [​IMG]) and a good 140 amp alternator will keep up, as long as you have a good battery...........or for that matter, TWO good batteries. I would focus on putting in an isolator with two good batts being charged with one good alternator (like a WranglerNW for one example) and call it good.

    Hey, where are you by the way? I grew up in Valley Stream.............

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  4. newyorkin

    newyorkin 1 ton status

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    Re: Running two alternators

    I'm in Huntington, good to meet another former LIer! Hopefully I'm soon to join the ranks of y'all that found greener pastures away from our beautiful over-crowded/over-priced island (PA is a real estate trip)...

    I think later today, I'll run it up and have it bench tested, I forgot about that altogether.

    I do eventually want to go with a bigger alt and dual batteries, but I won't be able to before we leave for Niagara, and wanted to be able to use the invertor with the AC and the stereo.



    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**
     
  5. newyorkin

    newyorkin 1 ton status

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    Re: Running two alternators

    Just want to top this.

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Re: Running two alternators

    Why not just remove your present alternator and install the one from the Buick? Seems like that would be much less trouble. [​IMG] That thing is probably rated at 100-plus amps.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  7. newyorkin

    newyorkin 1 ton status

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    Re: Running two alternators

    that's do-able too, but I don't know how to interface the two different circuits, and I'm wary of making permenant changes to the original as my eventual hope is for a big ole powerhouse alternator....

    Does anyone know how to do that, swap this one in place of my existing one without permenantly changing the circuit? The buick one has a 4-contact weatherpack, and my original has a 2-contact clip-on connector.

    I just picked up 2 "unknown" alternators from my junkyard dirt cheap (still haven't found out what they want for the D60, though). They're in a chevy housing with unknown amperage...

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**
     
  8. newyorkin

    newyorkin 1 ton status

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    Re: Running two alternators

    UPDATE:

    I found out tonight at my parts store while testing the new alts, the high-amp '92 Buick should work on my K5, but I'll have to splice the field and grounds from my old C connector into the weatherpack connector. The guys at the parts place said they wouldn't do it (they'd have the stock unit rebuilt with more power), but they don't see why it shouldn't work, and not to scream at them if something melts down...

    I'm gonna take the plunge... I'm going to splice in this alt in place of my stock altand see what happens... Actually, I think I'll test the swap-in theory on my Heep, then the K5...

    Ratch
    <a target="_blank" href=http://k5.8m.com>k5.8m.com</a>
    **Ever stop to think... Then forget to start again?**
     

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