Big alternator

Discussion in 'Audio & Electronics' started by chef choy, Mar 20, 2017.

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  1. chef choy

    chef choy GMFS Member

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    hey guys, looking to upgrade the alternator in my rig. Have done the big 3, and got a yellow top......just looking to rid myself of some dimming. I don't wanna do second battery.....so my question is, if I do go with a bigger alternator like this 253 amp on rock auto
    http://www.rockauto.com/m/mobilecatalog.php
    Am I going to have any issues like burning up my battery or have any warning lights on the dash?
     
  2. ibanender

    ibanender www.emfcaraudio.com

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    Batteries take as much power in as they want, alternators give out as much as they are demanded till they max out. You can't have too much alternator. Now, that being said, your link doesn't go to a product so I can't comment specifically on it. Generally speaking, if it's less than $1/amp it won't last and won't do rated power. I've seen plenty of cheap alts rated for 250 amps actually do 130 amps and routinely fail after 9 months, exactly 9 months, every time.
     
  3. 2005_Silverado

    2005_Silverado *

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    zero issues with my DC power 300A alternator but its not cheap
     
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  4. Cel81xtreme

    Cel81xtreme GMFS Member

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    same and its been 4 years (knock on wood)
     
  5. ibanender

    ibanender www.emfcaraudio.com

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    I have a 370 on my Sierra and two 370's on my Astro, zero issues but as said, not cheap. Know why they aren't cheap? They don't die.
     
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  6. chef choy

    chef choy GMFS Member

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    Yea, did a search and saw that the DC alts are like 600 bucks.......way outside of my price range. I was hoping to find something under 200 bucks. Tried that link, but here is an image of what I was looking at........
    [​IMG]
     
  7. 2005_Silverado

    2005_Silverado *

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    good luck...post results
     
  8. Nasty

    Nasty GMFS Member

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    You get what you pay for it can guarantee the one you found is worse then stock
     
  9. OceanSpray

    OceanSpray New Member

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    Don't know what alternator you have, but here's a possible and cheaper option. On my Cummins 6BTA boat engine, I have a stock Delco Remy 105 amp alternator. When it crapped out, I had it rebuilt... new regulator, trios, battery post, and replaced stator with a 160 amp unit. This Delco alternator frame could accept up to a 200 amp stator. Rebuild cost $160. Something to look into.
     
  10. chef choy

    chef choy GMFS Member

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    Something like that is EXACTLY what I am after. I will have to see if there is a shop here that does that kind of work.
     
  11. Nasty

    Nasty GMFS Member

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    Look up us alternators. I have one in my nbs. It's a 3phase but it puts out great power
     
  12. ibanender

    ibanender www.emfcaraudio.com

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    $200 for a 250 amp is gonna cost you $800 after you replace it twice before you decide to spend the right amount for that size.
     
  13. benz88

    benz88 GMFS Member

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    make sure its got a good warranty lol
     
  14. Canadian Z71 L33

    Canadian Z71 L33 GMFS Member

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    What are you running for accessories? That can help determine how many amps you may need.

    Sent from my SM-G920W8 using Tapatalk
     
  15. NYresq

    NYresq New Member

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    Have a DC power 250amp. Zero issues. You get what you pay for when it comes to alternators.
    If your budget is very limited, having your stock unit rebuilt and up its rating may be the direction you wanna go.
    Changing the pully to a slightly smaller unit may help to keep the rpms up where it makes more power while the engine is crusing at lower rpms.
     

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