How long can a new battery last with a dead alt? - FirebirdV6.com/CamaroV6.com Message Board

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  • How long can a new battery last with a dead alt?

    2 questions here:

    a)Roughly how long can you drive a car with a brand new battery and a dead alternator?

    b) As far as I know, there is no way a drained battery can kill an alternator. Am I right?
    1999 Pewter Camaro M5<br />Y87 Performance Package, Sport Appearance Package, Diamond Clears<br />Factory SS Hood, Free Ram Air Mod, Whisper Lid w/ K&N Air Filter<br />CarSound Cat 94009, B&B Tri-Flo w/ Quad Tips<br />BMR SFC, BMR STB, KVR Blank Rotors, Hawk HPS Pads<br />Black Painted Calipers w/ CAMARO Decal, 245/50 Dunlop SP Sport 5000<br />20% Rear 35% Side Tint, Red Reflective Inlays, Invincishield<br /><b>Young girls avert their eyes, weak men tremble, Ford dealers faint.</b>

  • #2
    a) depends on what you run in the car (lights, a/c). i have run 15-30 minutes on a dead altenator. it would be bad for the battery.

    b) the alternator/charging circuit is not meant to be used to recharge a dead/flat battery. you can damage the alternator (and void any warranty you might have on the altenator). use a battery charger to charge the battery.

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    • #3
      I think you can actually ruin the battery if you drive around with the alternator gone...
      Last year my alternator took a crap on me and my dad wouldn't let me drive my car AT ALL because you can easily get stranded... You can run a Deep Cycle battery all the way empty then charge it though, thats what they're for [img]smile.gif[/img]
      <b><a href=\"http://members.cox.net/95batmobile/d86f.jpg\" target=\"_blank\">Sinister Six©</b></a><br /><a href=\"http://www.sounddomain.com/id/95batmobile\" target=\"_blank\">My \'95 Bird</a><br />I am not afraid of storms, for I am learning how to sail my ship.

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      • #4
        you can deep cycle a car battery a couple times but it does shorten the life. there is also a small chance that it wont take a charge after a deep discharge.

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        • #5
          My alt died and I was able to drive for about 60 miles before she finally gave up....and it wasn't pretty at the end....but I have an optima yellow top deep cycle.
          <a href=\"http://www.onid.orst.edu/~waltejam/\" target=\"_blank\">98 Bright Red Camaro</a><br />Too many mods to list....check my website

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          • #6
            i drove 27 miles with a dead alt on the highway, not running any electrical crap like radio ,a/c all that, definatly not headlights...

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            • #7
              Originally posted by Big Tymer:
              i drove 27 miles with a dead alt on the highway, not running any electrical crap like radio ,a/c all that, definatly not headlights...
              Same for me....cept the headlights....it was nighttime so I was forced to. Luckily they are HIDs and only pull 35W each.
              <a href=\"http://www.onid.orst.edu/~waltejam/\" target=\"_blank\">98 Bright Red Camaro</a><br />Too many mods to list....check my website

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              • #8
                I ran like 30 miles in my 3.4L when the alaternator cable was corroded and snapped during an autocross(all the wierd problems seem to happen at autocrosses with me)

                As for my 3.8L... I have done 5 passes, some heater usage, fan usage... all off the battery and didn't seem to phase it at all..

                but I hear it shorten's the life of the battery...

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                • #9
                  I drove around 20 miles with no alternator in my old car. Everything was kept off.

                  and yes, drained battery can brake the alternator.

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