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Old 12-09-2005, 07:04 PM   #1
Ali Baba
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****Disconnecting My Battery!****

alright i want to disconnect the battery on my 2005 clk 320 because the radio/cd player stopped working and i want to reset it. i can't find the fuse for the stereo or amp or anything so i was going to just disconnect the battery and reconnect it... i wanted to know if this will be safe.



This is the whole battery
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this is the negative terminal on the battery
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this is the positive terminal
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Which one should i disconnect... and can i use just a regular socket wrench to take this off?




Thanks in advance.
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Old 12-09-2005, 07:18 PM   #2
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disconnect the positive, and yes you can use a regular socket... just make sure you dont touch the frame or anything (ground)
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Old 12-09-2005, 09:02 PM   #3
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Disconnect the NEGATIVE

Always disconnect the negative battery lead. It is much safer than disconnecting the positive because of the potential for your wrench or socket to contact ground - shorting the battery. I know of a guy who lost a finger because his wedding ring came between a socket he was using on the positive terminal and ground (with the negative still connected).

To repeat - always disconnect the negative lead. If you need to disconnect both, do the negative first then the positive. When reconnecting do the positive first, then the negative.

Lou
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Old 12-09-2005, 09:05 PM   #4
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lol the positive
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Old 12-09-2005, 09:05 PM   #5
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Old 12-10-2005, 01:04 AM   #6
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Quote:
Originally Posted by voerman
Always disconnect the negative battery lead. It is much safer than disconnecting the positive because of the potential for your wrench or socket to contact ground - shorting the battery. I know of a guy who lost a finger because his wedding ring came between a socket he was using on the positive terminal and ground (with the negative still connected).

To repeat - always disconnect the negative lead. If you need to disconnect both, do the negative first then the positive. When reconnecting do the positive first, then the negative.

Lou
i 110% agree! i had this happen to me with a tool before however it was insulated, just a slight burn on my finger! always disconnect negative first!
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Old 12-10-2005, 01:17 AM   #7
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Originally Posted by Nico3k
disconnect the positive, and yes you can use a regular socket... just make sure you dont touch the frame or anything (ground)
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Old 12-10-2005, 01:26 AM   #8
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Lou
Fvcking negative.
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Old 12-10-2005, 01:46 AM   #9
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interesting, i never knew this...

i didn't pay much attention in science class, so can someone explain to me why you should disconnect the negative first(i know so it doesn't shock you, but why?)?

and what exactly is a "ground"?
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Old 12-10-2005, 02:35 AM   #10
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disconnect the one with the minus sign
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Old 12-10-2005, 08:56 AM   #11
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Originally Posted by Cobra
interesting, i never knew this...

i didn't pay much attention in science class, so can someone explain to me why you should disconnect the negative first(i know so it doesn't shock you, but why?)?

and what exactly is a "ground"?
I'll try to make up for your not paying attention in science class.

The negative terminal of you battery is connected to the chassis of the car. This referred to as a "negative ground" system. Almost all car manufacturers do this (there were a few positive ground cars but they are old and very hard to find).

So - almost any bare metal in your car will be connected to the negative terminal of your battery. The effect of this is that if you use a wrench on the positive battery terminal (with the negative still connected) and it touches any bare metal, you will short the battery through the wrench. This is extremely dangerous since the battery can provide a large amount of current. The wrench will get very hot and could seriously burn you. In the worst case, the battery could explode.

If you have a wrench on the negative terminal and it touches bare metal, no harm is done since the negative terminal is already connected to ground. So when working on your battery, disconnect the negative terminal first and make sure the cable you remove can't accidently make contact with the negative terminal.

Lou

Last edited by voerman; 12-10-2005 at 08:59 AM.
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Old 12-14-2005, 01:49 PM   #12
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Originally Posted by voerman
I'll try to make up for your not paying attention in science class.

The negative terminal of you battery is connected to the chassis of the car. This referred to as a "negative ground" system. Almost all car manufacturers do this (there were a few positive ground cars but they are old and very hard to find).

So - almost any bare metal in your car will be connected to the negative terminal of your battery. The effect of this is that if you use a wrench on the positive battery terminal (with the negative still connected) and it touches any bare metal, you will short the battery through the wrench. This is extremely dangerous since the battery can provide a large amount of current. The wrench will get very hot and could seriously burn you. In the worst case, the battery could explode.

If you have a wrench on the negative terminal and it touches bare metal, no harm is done since the negative terminal is already connected to ground. So when working on your battery, disconnect the negative terminal first and make sure the cable you remove can't accidently make contact with the negative terminal.

Lou
Everything made sense here except for the end, did you mean to say "and make sure the cable you remove can't accidently make contact with the *POSITIVE* terminal."?
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Old 12-14-2005, 02:10 PM   #13
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I was like my battery terminal doesn't look like that, but then I noticed it's a Mercedes and NOT a BMW.


So, by now you should know to disconnect the negative first.
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Old 12-15-2005, 08:26 AM   #14
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Originally Posted by FlzRider
Everything made sense here except for the end, did you mean to say "and make sure the cable you remove can't accidently make contact with the *POSITIVE* terminal."?
I meant the NEGATIVE terminal. The wire is fairly stiff and will try to "return" to the terminal after it is disconnected. I usually wedge it behind or under something so it can't accidently make contact with the negative terminal. If it did, and you didn't notice, it could ruin your day.

Lou
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Old 01-01-2008, 02:17 PM   #15
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i always forget which one has to be disconnected first LOL, thanks!
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Old 01-01-2008, 03:33 PM   #16
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Originally Posted by FlzRider View Post
Everything made sense here except for the end, did you mean to say "and make sure the cable you remove can't accidently make contact with the *POSITIVE* terminal."?
It would also be bad for the Negative cable to make contact with the Positive terminal. However, as Lou indicated, the cables are pretty stiff and there usually isn't a lot of slack in them, so it would be difficult for the Negative cable to accidentaly reach the Positive terminal.

But if the Negative cable isn't pinned out of the way as Lou described (or sheathed with an insulator, or the terminal is covered) it's actually likely to "wander" back and lay against the Negative terminal, re-closing the circuit. If you start to do some work on the car, the realization that there IS, in fact, electricity being supplied by the battery circuit (when you thought there wasn't) is often surprisingly painful and impressively destructive.
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