Thread: Finding +and- on a cap

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  1. #1 Re: Finding +and- on a cap 
    GrandPrix Junkie Sabrewings's Avatar
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    Quote Originally Posted by reinke View Post
    all i have to say is DAMN your a dumb ass. adding a second battery will give him more reserve. a battery with a CCA rating of 600amps is like adding a 100 farad capacitor. what you are saying is that the battery in the front of every vehicle serves no purpose then.
    Yeah, I have a few years of college level electronics courses. I repair complex electronic equipment every day for the Air Force. I must be a dumb ass. Thanks for letting me know.

    When the vehicle is running, the battery is supposed to be charging and doing nothing else. So, as long as the engine is running it does serve no purpose, and if it does your alternator requires upgrading. If the battery did have a purpose during engine operation (other than to recharge itself off the alternator), then removing it with the engine on should have some effect. Guess what, you can take the battery out with the engine running and the car is none the wiser. The only reason a battery has to do anything with the engine running is when the alternator can't handle the load and its voltage drops. Then the battery has to step in and supplement it.

    The battery's purpose is to start the car and power the electronics when the engine is off. Not when the engine is running. If you don't understand a basic parallel power supply circuit, then perhaps you should hold off on the name calling.

    The problem with adding any supplemental power source (like another battery or a cap) is that once that source is tapped at all, it becomes a load on the alternator. You get a nice string of hard hits from your stereo, and now your cap is dead. From now on, until you turn down the volume or pause the music, the cap is putting more load on the alternator than before since it's trying to recharge. Similar situation with adding a second battery, or relying on the factory battery to supplement the alternator.

    So, it comes back to the fact that the only real solution is to get a better alternator. Any intelligent questions or do you want to go back to name calling?
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  2. #2 Re: Finding +and- on a cap 
    GTP Level Member JoshMcMadMac's Avatar
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    Quote Originally Posted by Sabrewings View Post
    Guess what, you can take the battery out with the engine running and the car is none the wiser.
    Please do not ever do that. It used to be the case with older cars that you could start the car, then pull the battery. That is no longer so, and pulling the battery with the car running can create a bad situation for a lot of the electronics in a modern vehicle.
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  3. #3 Re: Finding +and- on a cap 
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    Quote Originally Posted by JoshMcMadMac View Post
    Please do not ever do that. It used to be the case with older cars that you could start the car, then pull the battery. That is no longer so, and pulling the battery with the car running can create a bad situation for a lot of the electronics in a modern vehicle.

    i did it just yesterday...car ran for 5 minutes with no battery until i switched it out. Ran just fine no problems to report....
     

  4. #4 Re: Finding +and- on a cap 
    GTP Level Member JoshMcMadMac's Avatar
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    Quote Originally Posted by _nick_ View Post
    i did it just yesterday...car ran for 5 minutes with no battery until i switched it out. Ran just fine no problems to report....
    I have jumped off of a roof before, and I still run just fine...that does not make it any more of a good idea. The potential spike of removing and/or adding the battery can very easily damage some of the more sensitive electrical components on the vehicle.
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  5. #5 Re: Finding +and- on a cap 
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    cant see how it would spike the voltage when a battery runs at a lower voltage than your charging system. There was actually a TSB for my old car that required disconnecting the battery while the engine is running to diagnose it.
     

  6. #6 Re: Finding +and- on a cap 
    GTP Level Member JoshMcMadMac's Avatar
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    Quote Originally Posted by _nick_ View Post
    cant see how it would spike the voltage when a battery runs at a lower voltage than your charging system. There was actually a TSB for my old car that required disconnecting the battery while the engine is running to diagnose it.
    Just remember: voltage hurts, amperage kills. There is more to the equation then 12V DC.
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  7. #7 Re: Finding +and- on a cap 
    GrandPrix Junkie Sabrewings's Avatar
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    Quote Originally Posted by JoshMcMadMac View Post
    Just remember: voltage hurts, amperage kills. There is more to the equation then 12V DC.
    True, but all of the components in the car are protected by fuses, which blow with amperage.

    He's right that for a lot of issues in TSBs GM has recommended disconnecting the battery and reconnecting it as part of the troubleshooting. Wouldn't be wise to do that if you're going to hurt the customer's car.
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