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Damage Jump Starting

Discussion in '2nd Gen. Tacomas (2005-2015)' started by USNavyTaco, May 24, 2011.

  1. May 24, 2011 at 5:41 PM
    #1
    USNavyTaco

    USNavyTaco [OP] Well-Known Member

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    2 inch coil spacers up front, tsb rear, Kobalt toolbox, westin bull bar, driver seat height mod, jvc head unit, rag joint zip tie truss mod, 17inch alloy 4runner sr5 rims wrapped in 265 yoko geolanders, off road lights, uhaul hitch, tacoma seat covers, avs vent visors, debadged prerunner, mud flaps gone, scanguage II, glovebox shock absorber mod,flowmaster 40 exhaust,
    Well. Heres a sad story of what idiot people do in idiot cars.

    Was jump starting a classmates BMW x5 with my tacoma. Well. The idiot decided that he was going to go try and start it while the cables are connected, which is fine. But what he did next was scary. He floored his x5 once he got it started. I mean. He redlined his engine. Is there any chance he damaged anything vital electronics wise in my truck? Would any damage or overload appear immediately?
     
  2. May 24, 2011 at 5:43 PM
    #2
    97yota4wd

    97yota4wd Well-Known Member

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    i dont think so? he would just charge your battery i believe. not too sure though
     
  3. May 24, 2011 at 5:43 PM
    #3
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Should be fine.
     
  4. May 24, 2011 at 5:44 PM
    #4
    rex99

    rex99 Well-Known Member

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    this
     
  5. May 24, 2011 at 5:46 PM
    #5
    Rucas

    Rucas 1st gen > 2nd gen

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    isnt that what your supposed to do?
     
  6. May 24, 2011 at 5:52 PM
    #6
    tommyc

    tommyc Well-Known Member

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    Yo Dude you should be good as long as you connected the cables correctly, you didn't do neg to neg pos to pos. next time tell him screw call AAA
     
  7. May 24, 2011 at 5:54 PM
    #7
    bjmoose

    bjmoose Bullwinkle J. Moose

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    Voltage is not proportional to rpm, and the alternator is regulated.

    Nothing to worry about here.
     
  8. May 24, 2011 at 5:57 PM
    #8
    Navigator

    Navigator Well-Known Member

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    X2.... + you worry too much. :D
     
  9. May 24, 2011 at 5:58 PM
    #9
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Tell the BMW guy to hold it to the throttle floor to charge the battery quickly.

    [​IMG]
     
  10. May 24, 2011 at 6:02 PM
    #10
    USNavyTaco

    USNavyTaco [OP] Well-Known Member

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    no i did positive to positve, negative to grounding point on his engine block.

    I know nothing is amiss..yet... although it did start weird this morning...

    and voltage is regulated, thank god...thats good to hear......ive got him all worried. i told him my truck is dead and that i called the cops...kid is crapping his pants right now...

    i just always thought that current can backflow? or is this only when connecting pos to pos and neg to neg?

    and if current ever does backflow, just for future reference, wouldnt a blown fuse be the first indication? or any problems with electricals popping up immediately? sorry just new to these trucks..old car had a surge protecting battery, this one has a standard one...
     
  11. May 24, 2011 at 6:03 PM
    #11
    TacoSport

    TacoSport opinions are like assholes; everyones got one.

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    Lucky for you in this case, he's only hurting his engine by revving it up when it first starts. Next time shut off your motor during charge or don't do it at all.
     
  12. May 24, 2011 at 6:08 PM
    #12
    USNavyTaco

    USNavyTaco [OP] Well-Known Member

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    So just to be clear,and to learn... an alternators output is NOT proportional to the RPM of the engine? i thought that is why you give the GOOD car in a jump a little gas? to increase alternator output?
     
  13. May 24, 2011 at 6:13 PM
    #13
    babytruck

    babytruck Babytruck, babytruck...I've got a babytruck :)

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    Why did you do that ^^^ ?

    Your truck should be fine. Usually when you jump start a car you do it with the cables still connected.
     
  14. May 24, 2011 at 6:16 PM
    #14
    USNavyTaco

    USNavyTaco [OP] Well-Known Member

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    cause im not a huge fan of this kid.. so i figured id scare him a bit...the only reason i jumped him is cause i figured someone who doesnt like me would do the same for me.. IE.. karma.....

    hopefully no electrical gremlins will pop up now.. if i wanted to live with those i would have bought a jeep grand cherokee....
     
  15. May 24, 2011 at 6:33 PM
    #15
    JKD

    JKD Well-Known Member

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    It's a little complicated, but at low RPM an alternator's output can 'droop' even with maximum field current. The field current is how the regulator or computer controls the alternator output.

    So you bump the RPM up a bit above idle, and that lets the alternator put out what the regulator/computer is requesting .

    The regulator/computer is mostly just looking to keep the system voltage at the optimum level. It varies a little with temperature (higher voltage in cold weather). Usually you don't see normal operating voltages outside of 13.5 to 14.5 volts.

    So, the other car would have tried to boost its alternator output until it saw 13.5-14.0 volts, which it would have probably seen just from your jumper cables being connected anyway.

    tl;dr = Your truck is fine.
     
  16. May 24, 2011 at 6:33 PM
    #16
    Fire Force

    Fire Force Well-Known Member

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    I second this gentleman's post.
     
  17. May 24, 2011 at 6:50 PM
    #17
    USNavyTaco

    USNavyTaco [OP] Well-Known Member

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    Ah JKD good post. Now i understand.

    Next time I'll just hand him the phone number for AAA and tell him to screw off. Then proceed to create tire smoke.
     
  18. May 24, 2011 at 6:57 PM
    #18
    fletch aka

    fletch aka www.BeLikeBrit.org

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    X1
     
  19. May 24, 2011 at 6:57 PM
    #19
    Steves104x4

    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    Tell him he should FLOOR IT for 5 minutes.



    Steve
     
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