disconnecting car battery

[hugohung23]

was curious what happens when u disconnect the car battery when the engines running? Is it safe to do so?

[Raztaz]

i highly recommend u NOT do that not only for ur car but also ur safety. Remember when the engines going it means all acc. are running and batt is also charging. If u accidentally cause a spark when all thats going...

[dc2dc2dc2]

why would u do such a thing

[Raztaz]

Google search says

Do NOT ever disconnect a battery cable from
car with the engine running because the battery acts like a filter for the
electrical system. Unfiltered electricity can damage the electrical
components, for example, computer, radio, etc. Check the electrolyte level
before recharging.

[hugohung23]

Thanks, i googled it too, and it didnt look like a good idea.

[JohnL]

In the old days it wasn't all that dangerous to do (not a great idea for any extended period), but modern cars have ultra sensitive electronics that are dead easy to fry...

[Ninjadust77]

u can do it on older cars but i wouldnt suggest doing it to any car 1995+
iv done it before in my older cars (91' MX6, 85' Sigma, 95' R33, 91' Patrol) to charge up a flat battery.... works fine and didnt fukup the car

[EGB18CT]

try it and tell us the results, only one way to really find out!

[RtN]

Hmm I believe you shouldn't try it.. could be very costly! And I agree with what the other guys said and this site says it too:

14.6 on this site:

http://www.rpc.com.au/products/batteries/car-deepcycle/carfaq14.htm#test

[Bludger]

you can do it, I've done it, a previous post said, in earlier cars, its not so bad, but these days, the cars have many electronics.

once my car battery was dead. I hooked up a good battery and started the car, I then proceeded to put the old battery back into the car, disconnecting the good battery to hook up the old one. I then went for a drive to charge the old battery.

IMHO it is ok to do so, many ppl might disagree with me and my methods, but i know what i'm doing :)

just makes me laugh sometimes when reading on these forums, some ppl are just too much "by the book" sort of ppl
I'm a dodgy fuker but I've never gotten myself into trouble:)

[teaseR]

ive done it to my car...
nothing happens... the alternator should keep the acc. going

[Sir_vtec]

why did u do it at first? LOL

[teaseR]

flat batt... use another battery to start the car... then swap them over to charge the flat one

[Crapdaz]

it shouldn't do anything as your car is running by the alternator, the battery is mainly for cranking to start.

BUT why would you want to do such a thing?