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Altanator options, high amp??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Burt4x4, Jan 7, 2002.

  1. Burt4x4

    Burt4x4 3/4 ton status

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    Hey gang my 120amp alt is no longer puttin out juice![​IMG] It has been on my rig for about 6yrs now(WOW time flys!). I orginally gotit from a autoelectric shop that did cutsom alt builds for highr amps.
    My question is, should I try and get this one rebuilt or go with a new high amp alt? I did look into the Powermaster brand and they want 329.00[​IMG] for their 200amp (at hwy speeds and at idel 120amps)! Way too much $$! I am willing to pay for top quality stuff but I think that price can be beat!
    Any ideas, thoughts and/or suggestions on the best altinator for the money would be GREAT!!!!!
    Oh and I need the high amps for my dual batts and winching.....


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  2. BurbinOR

    BurbinOR 3/4 ton status

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  3. HarryH3

    HarryH3 1 ton status Author

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    The most common failure item on alternators are the brushes. A new set will cost ya $5-10. [​IMG] Next in line is the diode pack and voltage regulator. Again, pretty cheap items. It's very rare to have a problem with the windings, which is the expensive part. I'd try to figure out what's wrong with the one you already have. Could be a cheap fix.

    <font color=black>HarryH3 - '75 K5</font color=black>
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  4. ftn96

    ftn96 1/2 ton status

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    Well, Burt your running dual batteries or something like that aren't you? Well, if you are you dont really need to get the 200 amp alternator. I talked to one of the guys at powermaster and he said the 200 amper ones are great but if your running that much juice through them on a single rectifier type it will burn it up pretty quickly and they wont replace it.
    They highly recommended the 140 amp dual recitifier and with your battery setup you should be good to go.
    I just installed a 170 amp dual rectifier from alternatorparts.com, it was $312 shipped to my door.

    Still hoping the GOV'T will ban the use of loud stereos with RAP music. [​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    Great Stuff!! Thanks guys!!

    hey ftn, rectifier?? So are you saying there are two types of alts. and with my Dual Optima800 w/Helroaring iso/combiner I should use a "dual rectafier" type?
    pls elaborate on what this rectifier technology is....
    I never knew an altinator would care if you had one or two batteries???
    Thanks a ton!
    Burt


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  6. ftn96

    ftn96 1/2 ton status

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    Im no electrical wiz but if you have an isolater battery setup, when your winching you seperate the normal operating battery away from the load and send it to the other battery so if you use up all your juice in that battery at least you still have fully charged battery.
    The dual rectifier is basically a double door insted of a single door. It channels the power out of thee alternator via 2 paths to hlpe keep the diode from getting to hot. All the juice still flows down the same power wire to the battery setup, it just gets out of the alternator to the wire via 2 rectifiers. At least thats the laymens terms of how it was explained to me.

    Still hoping the GOV'T will ban the use of loud stereos with RAP music. [​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  7. Burt4x4

    Burt4x4 3/4 ton status

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    Hmm Ok so the dual would be considered the HDuty or extra duty type of alternator. Cooler diodes is a good thing!![​IMG]

    Thanks again!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  8. txbartman

    txbartman 1/2 ton status

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    One question for ya, why not go with another custom wind alternator? The big names usually give out more juice at low RPMs, but you can probably find a hi-power alt from a local alt/starter supply that will provide good power just off idle for a lot less.

    For example, I got a 180A alt from a local shop. It is wound in the original case so there were no bracket mods. It puts out only about 30A at idle (similar to stock), but jumps to 120A @ 1200 RPM and the full 180 @ 2100. I have been very pleased with it running a custom dual battery setup. While I don't have a winch, I do have 660W of off-road lights (that I do use). This alt, in black powder coating, ran my $136. If your last one was like that and lasted 6 years, why go for one of the big names when you have some proven success?

    Just curious...

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  9. Burt4x4

    Burt4x4 3/4 ton status

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    Your point is well taken!! And I will try to get the one I have tested/repaired first. I got this one fer 115 bucks back then and like you I haden't had ANY issues with it until now. I don't know didlly about alternators, heck it took me a while to figure out how to spell the word[​IMG]!!!
    I think I'll try the yellow pages whan I get home and try and find a shop locally. I moved away from the place that made my curent one.
    Thanks for comment!![​IMG]


    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  10. Boss

    Boss 1/2 ton status Author

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    I a 200 amp alternator from the same place that tx got his from I believe. It was like $150 or so. I was told it puts out all 200amp at 1500 rpms or so and puts out like 100something at idle. Eitherway, so far it is working great for me. I run Duals as well with the Hellroar iso/combo and run the HS9500i.

    Pic of my truck Before N' After
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