Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by spooky, Dec 29, 2007.

  1. spooky

    spooky New Member

    i got a question i have to replace my alternator on my 2003 silverado.its a
    k1500 lt fully loaded with factory dual batterys.the alternator thats in the truck is 105 amp i found.a replacement 140 amp the.12 olock postion lines up,and itll plug right in will this alternator work.with all the options on my truck and dual batterys 140 amp should be fine.any ideas or advice:neutral: the higher amps shouldnt hurt since its 130-140 amp right
    Last edited by a moderator: Sep 22, 2009
  2. ChevyFan

    ChevyFan The Sheriff Staff Member 5+ Years 1000 Posts

    I forget the rule on this, but I think that you're ok with the higher amp alternator, especially since you're splitting it between two batteries.

    Was this a factory dual battery (like a camping package?) or aftermarket or do you know?
  3. TahoeFever

    TahoeFever Epic Member 5+ Years 500 Posts

    you should be fine as long as it was a recomended size for your truck

    mines a 145 amp just swapped it out yesterday due to a bearing squeal
  4. spooky

    spooky New Member

    re alternator

    dual batterys was orderd with the truck.i baught the truck in aug im the second owner,orig owner orderd the truck special.i got a real good has alot of options z71 pkg.4x4,leather,bose stereo,tow package.cold weather package.ride control shocks.i wanted to upgrade to a better alternator mines starting to go out.i curentley have a 105 amp.want to upgrade to 130-145 amp.ive seen 200 amp ones for this year truck.i thaught that was too much.thanks for the imfo guys i do plan on adding.hid offroad lights soon.and i have an alarm.the batterys are dual interstate mtp78's
    1000 cca.i already had one dead battery,the aux was ok.dont want to get stuck somewhere
    Last edited: Dec 31, 2007
  5. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    You'll be ok with the larger alternator. Almost all alternators have a built in regulator designed to shut down the charging system if it senses an over voltage condition. Regulator failure is actually the most common problem with defective alternators.

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