Alternator question

Discussion in 'Engine Performance + Maintenance' started by smdk2500, May 15, 2018.

  1. smdk2500

    smdk2500 I'm Awesome

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    The cheapo reman alt some one put on my truck crapped out on me tonight. I am thinking about installing a 140 amp alt. What size wire is suggested to upgrade the wire from the alt to the battery?. Im guessing I should make it atleast 8 gauge. Is this over kill or under kill?
     
  2. Gavin

    Gavin Supporting Member

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    4 AWG is what I see in the "Big 3 Kits" for alternators up to 150 amps.
     
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  3. kennythewelder

    kennythewelder B31-3 (6-G) certified

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    AWG #2 is what I used form my big 3 upgrade, but I did a little more than 3, mine is 5 points all together, not just 3. I have a thread about it on here, some where.
     
    Last edited: May 16, 2018
  4. df2x4

    df2x4 Domestics only.

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    Personally if you're doing it, id go 0ga. Do it once, do it overkill.
     
  5. smdk2500

    smdk2500 I'm Awesome

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    What is the big 3 upgrade?
     
  6. RDF1

    RDF1 I'm Awesome

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    The 3 main wires in your electrical system.
    Usually a larger wire from Alternator to battery. Larger wire from block to frame, and finally a larger wire from frame to body.


    I mainly use 1/0 welding wire since I have a unlimited supply of short drops of it at the shop.

    Sent from my SAMSUNG-SM-G870A using Tapatalk
     
  7. kennythewelder

    kennythewelder B31-3 (6-G) certified

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    Like I said, I did a big 5 up grade. Mine has 4 negative wires and 1 positive with a fuse from the alt, back to the battery. Here are some videos, and pics of mine.




    20170811_193854.jpg 20170811_193913.jpg 20170811_194023.jpg 20170820_171940.jpg 20170811_194003.jpg
     
  8. kennythewelder

    kennythewelder B31-3 (6-G) certified

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    More pics of mine.
    20170811_194127.jpg 20170811_194044.jpg I used #2 AWG welding lead wire.
     

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