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Dual batteries vs high output alternator

Discussion in 'Chevy Trucks' started by maxximus98, Nov 29, 2011.

  1. maxximus98

    maxximus98 Member
    Messages: 52

    Hi I have a 2008 Chevy silverado 2500hd. I have had an issue with plow slowing down after hours of plowing and volts dropping. My question is should I start with dual batteries or upgrade the alternator? I intend on changing the existing battery regardless but was wondering which will give me the best gain? Thanks for your responses
  2. Burkartsplow

    Burkartsplow PlowSite Veteran
    Messages: 3,248

    I would upgrade to dual batteries. I have done it with every Chevy I have owned. All the trucks have the plow prep with the 135amp alternator. I don't upgrade the alternator until the original one is going down.
  3. deicepro

    deicepro PlowSite.com Addict
    Messages: 1,124

    I always upgrade the alternator first, that way the original can be a spare....
    I try to find a 140 to 160 amp alt..paired with a yellow top battery....great combo
  4. Holland

    Holland Senior Member
    Messages: 605

    Dual batteries worked great for me
  5. mnglocker

    mnglocker Senior Member
    Messages: 922

    The batteries are a buffer to your alternator. I'd start with the Batteries, then upgrade the alternator when funds are available, keeping the old as a spare.
  6. Mr.Markus

    Mr.Markus PlowSite Fanatic
    Messages: 5,106

    Next time get the twin alternators from Chev. It is like night and day. my 07 is still on it's original batteries. I run an eletric salter,plow, lights etc and never see my amperage gauge move. This helps solenoids & motors last longer.