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alternator charge wire... how big???

Discussion in 'The Garage' started by RootBreaker, Feb 25, 2007.

  1. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    Ok so my truck has a 63A alt in it... I may upgrade it eventually to a 80A just to do it.. I did at one point get ready to do the 140A pontiac Transport Alt upgrade... still may do it in the future but then need a new isolator....


    anyway... what size wire should I be running from the back of the alternator to the isolator? 12 gauge? I have a 2 gauge I could use but too big will not be a good thing.....


    also I need to run another wire from under the hood back to the bed... right behind the cab... same size? or a bit bigger due to about 10' length?

    please lemme know as i am getting ready to goto the parts store...... :crazy:
     
  2. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    bigger IS always better, well, alot of the time..... :wink1:

    other than bulkiness, size constraints... minimum wire gauge is a function of amps drawn over distance...

    For a stockish replatement, I'd run 10, even 8 if I was gonna be working the alternator hard... Personally, I'm running 4...

    For a rear feed, I'd up that a couple to an 8 or 6...

    check the chart at the bottom of this page..

    http://www.rbeelectronics.com/wtable.htm
     
    Last edited: Feb 25, 2007
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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  4. runamok151

    runamok151 1 ton status Premium Member

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    aren't you done with all those fancy switches yet?
     
  5. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    I got 3 in....
    didnt ya see that post?
    http://coloradok5.com/forums/showthread.php?t=198369

    [​IMG]







    anyway...
    I bought a roll of 10gauge wire today... and terminal ends.. gonna do some each night this week.. hopefully I can get the wiring done by friday so I can start on the spring bracket push back.....
     

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