Hey guys, gotta disconnect my battery before i go to greece. I thought my dad knew how to properly do it, but he doesn't. How do i properly disconnect my battery so i do not electricude myself?

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Own:
2013 C300 4matic
2009 C300 4matic

Owned:
2001 E320 Sport
1992 500E
1989 300SEL

First off, don't approach the car wearing enough jewelry to rival Mr. T!

That said, I'm not the foremost authority, but I remove the negative (ground) lead first.

I figure logically, if I'm using a long wrench or ratchet, I don't want to remove the positive (+) lead first anyway, because the opposite end may contact some metal portion of the engine compartment, and with the negative lead still connected, my tool completes the circuit (ZZZZAP...if you can get a mental picture of this).

In the future, I think the safest way to do this is to get one of those battery disconnect gizmos that attaches directly to your battery terminal. It has a big knob that you loosen, which disconnects the battery. I've seen it in many catalogs, including www.griots.com.

Enjoy your trip!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

I think the newer cars with the factory radio might have some issues with losing battery power. It is an anti-theft measure that requires you to enter a security code upon hooking up the battery again. You might want to check on this and make sure you have the security code first.

It may turn out that for a short trip of a month or two you'd be better off leaving the battery connected.

Some of the devices G-Benz mentioned have a small fused lead that keeps power going from the battery to the radio. That's meant to be a security device when you remove the knob - you can't start the car. Of course you can take the fuse out too and prevent battery drainage.

Have a nice trip. Someone with a newer car than mine may have more tips for you regarding the radio security code. My cars are all too old and have aftermarket radios anyway.

Ken300D

Yes, I wouldn't disconnect the battery for this time either, unless you think there is any dodgy wiring (from say, aftermarket radio or alarm) in there. At the worst, it'll go flat and you'll have to jump it.


later

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

Disconnect the negative first. Then if the wrench touches something nothing will happen, as oposed to a wrench on the positive terminal touching ground