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Hi-amp Alty and wires

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Dec 21, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    Ok, I've got the 170 amp altenator on the way. Lets assume its a "direct" bolt in.....Will my stock wires be able to handle the new amount of amps????? If not....What size should I use and where?

    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>
     
  2. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    You should take the opportunity to upgrade. Better cables will do justice to the $$$ you just spent. (and it may be required by the alt you will be getting - lucky dog!! :) )

    I think 02 or 00 will be good but haven't looked at it lately.

    Dave

    Horn Broken... Watch For Finger.
    <a target="_blank" href=http://coloradok5.com/gallery/Daves-Pics>http://coloradok5.com/gallery/Daves-Pics</a>
     
  3. BurbinOR

    BurbinOR 3/4 ton status

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    Is the alternator you are getting a direct charge? My WranglerNW 135 amp alternator has a huge direct charge cable that goes from the alternator direct to the battery.

    <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. ricka

    ricka Registered Member

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    For my 140A, I was told go with 4 gauge wire to the battery. This is the
    minimum. 2 gauge is probably better.

    -------
    Rick Anderson (rick.d.anderson@tektronix.com)
    Tektronix, Inc. Beaverton, OR 503-627-2630
     
  5. BobK

    BobK 1/2 ton status

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    I went with 2 gauge welding cable when I installed my 140 amp alt.Connected it directly from the back of the alt. to the battery.I just taped off the factory wiring and fastened it out of the way.All my gauges work as they did before the swap.Here's a pic of it in my 71 Blazer.
    http://www.imagestation.com/picture/sraid28/p52538ca832ebed4563e874eb3f25f930/fe16b5c5.jpg

    <font color=green>BobK<font color=green>
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    yup upgrade. The charging system is just like most everything else... you are only as strong as your weakest link.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  7. cooker

    cooker Registered Member

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    you should not use any thing bigger than 4 gauge why u ask
    if you use any thing bigger than 4 gauge the post off the back of the alternator could have a greater resistance than the wire it self and thus start to heat up and create a problem told this by ohio genertor guys they know of what they speak and remeber it is distance that can create resitance also your 4 gauge may only be 3 feet or less after the battery you can run anything since the posts are so large
     
  8. michaelm

    michaelm 1/2 ton status

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    never heard that before, sounds like BS
     
  9. ftn96

    ftn96 1/2 ton status

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    Yep, its SUPPOSE to be a direct replacement. With dual rectifiers. Dont know if that will affect anything as far as the wires go or not

    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>
     
  10. ftn96

    ftn96 1/2 ton status

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    here is the link
    www.nashvillek5.freeservers.com
     
  11. cooker

    cooker Registered Member

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    think about it if the contact on the back of the alt is smaller than the wire the contact will have more resistance than the wire the electricity will bottle neck at the contact and start to heat up electricity is like water
     
  12. michaelm

    michaelm 1/2 ton status

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    if the contact or any part of the system is too small to handle the load the alt is putting out it will heat up. this is not controlled by the largest part of the system. you dont hurt anything by running wire that is too large.

    your water coming out of the tap and into a bucket, does the bucket cause it to heat up?
     
  13. cooker

    cooker Registered Member

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    the bucket isnt the problem the restriction is the tap the 4 gauge wire acts as a choke to keep the flow even ohio generator makes large alternators for spl competition this is what they recommend and have found to be true and i agree i had a 300 amp alternator used 0 gauge wire and fried the back of thr alt the bolt on the alt where the charge wire connects becomes the smallest opening and thus creates the most resistence the same with your tap theory the tap is the smallest point so that is where the resitance lies dont believe me ask them there stuff is pretty awesome [OHIO GENERATOR]
     

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