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two batteries

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 85k5blzr, Mar 28, 2001.

  1. 85k5blzr

    85k5blzr 1/2 ton status

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    Is it possible to wire an optima yellow top in parallel to my existing battery without doing any damage? If so how?

    85 k5 blazer with an old 305....must have more power! [​IMG]
     
  2. '73 K5

    '73 K5 1/2 ton status

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    I'm not sure if that would be a good idea or not. Sometimes adding a second battery can do more harm than good. Why do you want to add one???

    '73 K5
    Chevy good...Ford bad
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    If you wires them up like that, then you have ot make sure you have two batteries in equal condition or one will drain the other.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>
     
  4. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    We had a post all about this a few months back, try hitting the search option. You really should only do it if you have some high-drain devices like a winch. Otherwise there is no real advantage.

    [​IMG]
     
  5. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Putting dual batteries in is nice when you have a winch or lots of lights or just for dependability. However, you don't just wire them in. You need a dual battery isolator. You can find many aftermarket versions and there is also a factory version.
    http://www.off-road.com/chevy/reviews/wranglerdb/


    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  6. BlueKnight

    BlueKnight 1/2 ton status

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    I can add to this. I have a die hard deep cycle for my winch and sound system. The main one is a red top optima. There is definitely a charging problem with one optima and one die hard. The optima always takes the charge first. The second battery rarely gets anything. It relies on the alternator to give it something when driving. I found this out because after trickle charging the system the optima was fully charged and the die hard had little to no charge


    <font color=purple>79' K-5 396cid 600hp, TH350, NP203</font color=purple>
    <A target="_blank" HREF=http://blueknight.coloradok5.com>http://blueknight.coloradok5.com</A>
     
  7. bandit

    bandit 1/2 ton status

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    All this battery talk made me think way not run 2 6volt batterys hook them up like a tractors so you would have one really big 12 volt battery this would also gives tons of cold cranking amps for the winch and the voltage for teh stero and lights? would this work or i have been around tractors to long?

    Bandit
    (Your right i dont understand the jeepthing)
     
  8. ragtop

    ragtop Registered Member

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    I've been running 2 batteries for just over a year now. A Diehard Deep Cycle in the origional location, and a regular Diehard starting battery in the second (drivers side) position, with a 400 amp relay to connect the second batt whenever the key is in the Ign. or Start positions plus an override switch to hook em both up together. I camp a lot (back seat replaced with bed) and usually leave the radio and cell phone on continuously for the weekend, along with burning the interior lights frequently at night. I usually have the deep cycle close to being discharged by Sun night, but the second batt always has no problem starting the K5 (even with the other completely discharged). I also have no problem with the stock alternator recharging both, and keeping them fully charged during the week (it's also my daily driver). I've been curious about problems with running this setup, but have not seen any ill effects yet. I have also been doing a 10 second @ 125 amp load test, bout every other month, to see if either battery shows any deterioration and so far, I've only seen about 0.2 volt difference, start to finish between the two batteries. Sure is nice, when the wife leaves the headlights on, or we run the one batt down while camping, to be able to flip the override switch and then just turn the key to start it!

    '88K5 - 350TBI, 700R4, 208, 3.42 10 bolts w/Auburns & 31s
    Ragtop - [​IMG]
     
  9. delta9blazer

    delta9blazer 1/2 ton status

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    hey ragtop, did you do all of it yourself, or was it a kit? do you have any pics of your install?


    <font color=purple>delta9blazer</font color=purple>
     
  10. pcorssmit

    pcorssmit 1/2 ton status

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    Properly wired, you could start the truck with a whole bunch of AAA batteries if you wanted, but I can't think of a reason why.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  11. Here is a link to my set-up

    Here is the link to my dual batery install I did from WranglerNW in my 2000 Z71. It is basically the same system, but different lengths of wiring and a different tray. Same operation though. I love it and would reccommend it to anyone wanting to get a little extra juice to run those extra toys. <A target="_blank" HREF=http://www.off-road.com/chevy/reviews/wranglerdb/>http://www.off-road.com/chevy/reviews/wranglerdb/</A>

    [​IMG]<font color=red>BigBurb[​IMG]
    <font color=purple>IF YOU'RE SCARED, SAY YOU'RE SCARED !!
     

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