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CAR battery: is it OK to do this?
So my car was left with the indoor light on all night and battery got drained. car wouldnt start.
the car was in my garage, and it was morning and late to work. I had no jumper cables or my neighbors.
A friend told me to remove the dead battery, use another battery from my other old pickup truck (good battery) and connect it to my work car.
start the engine (work car) and when the engine is running, remove the connected battery (pickup truck battery) and put back the original drained battery (while the engine is running) so that it can be charged and now I can drive my work car...
ive heard this can damage your alternator etc is it true or just someone was making stuff up?
from what I know, the battery is just there to start the engine...and power 12V electronics or lights when the engine is off.
and once the engine starts, the alternator feeds the car with the necessary voltages 12V to the ECU and other electronic devices...
Can this procedure be done? Ive seen technicians that service backup generators that carry a charged 12V battery so that when they go to a mountain or remote place and they need to start the generator to service it, they connect it that way...
25 réponses
- Anonymeil y a 4 ans
you need distilled water in battery otherwise will definitely not recharge check the level
- Anonymeil y a 4 ans
just jump it... no need to do all that swapping... yeah it can work though... it happened to me when i had to get to work fast... so i took the battery from my car and simply flipped it over, on top of the dead one, to touch the top posts directly together... +-+ ... yeah some acid dripped out but it started and i took off...
- Anonymeil y a 4 ans
You need distilled water in battery otherwise won't recharge check the level
- The DevilLv 7il y a 4 ans
That's just as good as jump starting. You should be fine as long as your battery only ran down from leaving on the lights.
- thebax2006Lv 7il y a 4 ans
Taking the battery cables off on modern vehicles puts the alternator into maximum output and can easily fry the alternator. The computer gets the full alternator output too which is way more than 12 volts and you can end up frying the computer too! It's cheaper calling Uber for a ride and buying a battery charger than taking the chance on making a $1200 repair job!!
Source(s) : Mitsubishi Master Tech - Steven SLv 7il y a 4 ans
This can be done but you would have to drive for some time to charge the battery.
- FlagMichaelLv 7il y a 4 ans
Absolutely not okay, except in an emergency situation in which it somehow provided safety to have the car running. The alternator is a current source controlled by a voltage regulator - a fundamentally unstable combination without the battery to provide voltage stabilization. The alternator is not in as much danger as the electronics in the vehicle. Most of the time you can get away with it, and most of the time you can get away with walking across a freeway with your eyes closed.
I didn't save the link, but a few years ago there was a question by somebody who had removed their battery cable to test the alternator. The engine died and would not restart when the cable was connected. I didn't have the heart to answer that one.
Source(s) : 50 years in electronics - MardukLv 7il y a 4 ans
Your car has a computer and probably your truck does too. So if you don't get electrocuted you will have two out of whack computers in your vehicles that would have to be reset. I would get a set of jumper cables and drive to work in the truck.
