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Dual Battery?

Discussion in 'Truck & Equipment Repair' started by snoaway, Dec 17, 2007.

  1. snoaway

    snoaway Junior Member
    Messages: 14

    So i replaced my main battery this weekend with a little larger battery from interstate. And i am wondering if i should change the other battery to the same as the new battery. If you could help me out with this one that would be great!!
  2. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 7,898

    Both batts should be the same age and size.
  3. snoaway

    snoaway Junior Member
    Messages: 14

    Alright sound good thats what i thought i just wanted to run it by someone else...Thanks
  4. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 7,898

    Any time.....
  5. adksnowo

    adksnowo Senior Member
    Messages: 370

    What SnoFarmer said. Otherwise the new battery's life wiil be shortened by the parasitic draw from the other battery.
  6. WINTER 3

    WINTER 3 Member
    from Vermont
    Messages: 80

    i was always told both batteries should be changed
  7. Niteman9

    Niteman9 Senior Member
    Messages: 165

    I put dual batteries in an 68 Chevy I had about 25 years ago and I wired them up with solenoids. I could switch to right, left, or both. Never left truck sit with both on. At the time I was told to do this way to prevent one from discharging the other. Work real well.
  8. tkrepairs

    tkrepairs Senior Member
    from maine
    Messages: 186

    all batteries changed simultaneously in any equipment. <--- period.
    that is, if you want longest life and max performance from your equipment.
  9. racer67x

    racer67x Junior Member
    Messages: 24

    I did the same kinda thing on my '97 Chevy Dually..it came with one battery but had the box and wire for a second one.
    I hooked up the second one with a solenoid activating it like you said,put an amp gauge to monitor it under the dash,then ran all my plow wiring off it.
    noticed that when I'd leave it off awhile in the summer months it would discharge..realized the gauge was slowly killing it.
    added another switch for the gauge and it works great!
  10. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 7,898

    Forget the solenoid or any switches.
    This defeats the reason for the two batts.
  11. mnormington

    mnormington Senior Member
    Messages: 156

    I AM thinking about adding a second battery to my Wrangler. Do you just hook the second one up in parallel to the first one? (example: positive terminal of battery 1 to positive terminal of battery 2, neg. terminal of battery 1 to negative terminal of battery2)

    Is that all there is to it?
  12. matts27

    matts27 Senior Member
    from CT
    Messages: 138

    Yep, positive to positive or you're creating a 24 volt system.... and remember hook the negative up last and make sure the terminals are treated. I like the battery terminal spray protector, lasts a long time, especially on a new batt. or cable. Penetrox works very well too negative to your ground (chasis) use it all the time at work 4 copper and aluminum.

    Hope that helps.:waving: