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Can a car still run if battery is pulled?

 
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Old 12-10-2010, 12:44 PM
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Can a car still run if battery is pulled?

So there is a topic of conversation in my class right now asking if a car is still able to run if the car is already running and the battery gets unplugged, could the car still run? even for a short time? In an aircraft they can so thats the argument.
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Old 12-10-2010, 12:47 PM
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Re: Can a car still run if battery is pulled?

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Originally Posted by coachroy View Post
So there is a topic of conversation in my class right now asking if a car is still able to run if the car is already running and the battery gets unplugged, could the car still run? even for a short time? In an aircraft they can so thats the argument.
Maybe it's because aircrafts have large capacitors? They also use turbine engines so when the propellers spinning, it'll keep spinning for a bit.

My assumtion was that if you pull the battery, the sparks don't ignite, causing no combustion in the engine. Then again, I don't know too much about engines.
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Old 12-10-2010, 12:53 PM
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Re: Can a car still run if battery is pulled?

yeah car will run, the battery is barely ever used, the battery main purpose is to give power to the starter, when the car is started the alternator charges the battery, and powers the car, its not suggested to do this, but the car will run as long as you need it to run when its running without the battery
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Old 12-10-2010, 01:59 PM
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Re: Can a car still run if battery is pulled?

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Originally Posted by texprelude View Post
yeah car will run, the battery is barely ever used, the battery main purpose is to give power to the starter, when the car is started the alternator charges the battery, and powers the car, its not suggested to do this, but the car will run as long as you need it to run when its running without the battery
No it won't. You are correct about the batteries main purpose and the alternators function, but if you disconnect the battery while driving you open up the circuit.

Opening a circuit cuts power to the whole circuit, including the alternator.
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Old 12-10-2010, 02:29 PM
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Re: Can a car still run if battery is pulled?

should run if you disconnect the (+) for alittle
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Old 12-10-2010, 02:33 PM
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Re: Can a car still run if battery is pulled?

Well how bout this. Someone go out to their car, start it up, and pull the battery.


I'll wait.









































What kind of flowers do you want sent to you in the hospital, btw? Just so I know which ones to order...
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Old 12-10-2010, 02:41 PM
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Re: Can a car still run if battery is pulled?

Trail and error my friend. Go start your car and pull the hot wire off. If you survive, try the ground.

Also, what's your favorite type of flower and cemetery of choice? Just wondering...
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Old 12-10-2010, 03:55 PM
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Re: Can a car still run if battery is pulled?

Don't Disconnect the Battery with the Engine Running
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Old 12-10-2010, 04:14 PM
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Re: Can a car still run if battery is pulled?

^^^ Google WIN
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Old 12-10-2010, 04:29 PM
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Re: Can a car still run if battery is pulled?

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Originally Posted by havikprelude View Post
^^^ Google WIN
Yea really lol, I saw that and was like this has to be gold! There do seem to be a bunch of debates about the topic though across the net.
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if it's knocking, don't answer it. it's prolly nothing but bad news bears.
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As much as I'd love to see this done, I offer you the same comment I offer everybody else: There's no point in being the first to do something if you're second across the finish line.
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Old 12-10-2010, 04:36 PM
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Re: Can a car still run if battery is pulled?

i do it at work all the time to swap batteries the main function for the battery is to crank over the engine the altenator will keep the car running dont even bother trying to argue wat im saying just go do it yourself the car will shut off tho if they alternator is bad or you touch positive terminal to ground. just dont **** up becuz you could cause damage. i do it all the time and have never have done anydamage
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Old 12-10-2010, 04:42 PM
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Re: Can a car still run if battery is pulled?

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Originally Posted by SiLude1990 View Post
i do it at work all the time to swap batteries the main function for the battery is to crank over the engine the altenator will keep the car running dont even bother trying to argue wat im saying just go do it yourself the car will shut off tho if they alternator is bad or you touch positive terminal to ground. just dont **** up becuz you could cause damage. i do it all the time and have never have done anydamage
You work at a automotive shop? Where at?



I would like to know, that way I know exactly where I'm never taking my car.
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Old 12-10-2010, 05:26 PM
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Re: Can a car still run if battery is pulled?

To answer your question, yes it will run. I drove my old crx to autozone to buy a battery with no battery in the car, not the smartest idea but it was my only choice at the time.

Could it damage your car, absolutely.

Personally, between me and my friend weve done it a few times in emergency situations (cars being stuck somewhere in the rain or middle of the night) and weve started each others car by swapping batteries when a jump wouldnt work and ive never had any kind of problem.

Not that im saying theres nothing wrong with doing it, but the question was "will the car run" not "will the car run without damaging anything"
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Old 12-10-2010, 07:32 PM
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Re: Can a car still run if battery is pulled?

Yes your car will run. I have done it but in only in situations wher I had to but of course it's not recommended.
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Old 12-10-2010, 07:41 PM
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Re: Can a car still run if battery is pulled?

My Brother's Lincoln LS Ran Without the battery being connected. In my situation I wouldnt Disconnect my battery while my prelude was runnning cause i have a MSD ignition, i don't even wanna find out if it will still run or not but i guess it will just for a little while. I did run my car for a few minutes without the alternator being connected, just threw a code but ran fine.

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Old 12-10-2010, 08:20 PM
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Re: Can a car still run if battery is pulled?

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Old 12-11-2010, 02:50 PM
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Re: Can a car still run if battery is pulled?

Simple answer is yes it will run.

Disconnecting the battery is a way to test the alternator and see if it's good. If the car shuts down the alternator is no good. This is a trick that has been used by mechanics for decades.

Hey Havik have you ever disconnected your battery while your car is running? Just wondering?
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Old 12-11-2010, 03:09 PM
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Re: Can a car still run if battery is pulled?

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Originally Posted by havikprelude View Post
No it won't. You are correct about the batteries main purpose and the alternators function, but if you disconnect the battery while driving you open up the circuit.

Opening a circuit cuts power to the whole circuit, including the alternator.

WRONG!!



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Old 12-12-2010, 02:26 PM
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Re: Can a car still run if battery is pulled?

c'mon i can't believe this was even a debate. some of you guys will believe anything you read if its on the internet. it's called a parallel circuit. remember 8th grade science class? for some of you it wasn't to long ago. i'm going on 15 years now. remember the parallel/series electrical circuit lesson? if you disconnect one of the lights in a parallel circuit, everything still works and also has no negative effect of explosion or fire or risk of death. the charging system in a car is a parallel circuit. i've done this countless times. and i've known others to do this countless times. the so called "reports" of death or injury due to disconnecting the battery while the car is running is somewhere along the lines of 1/10 of 1% (0.1%) of the actual occurrences result in disaster. about the same as fires/explosions occurring at the gas pumps. and somewhere in the same neighborhood as disasters as a result of jumping batteries improperly. there has to be some very specific factors going into play. something as simple if the humidity being to high could prevent an explosion.

where the problem most often occurs is reconnecting the battery. seen more often in higher voltage circuits, when reconnecting something you get a spark. just like when you go to jump a car. sometimes you get a spark when connecting either the positive or negative cable. that spark is obviously the disaster causing occurrence. but like i said, you still need all the factors to be in play. explosive fumes, a/f ratio, humidity, temperature, zero wind, enclosed spaces are preferred, etc... a shorted battery is one of the most common causes. however, if done properly, you will reduce your chances of disaster.. not that the chances are already low. you have a higher chance of dying in a car crash.

by the way, they don't call me beaker for nothing.
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