Disconnecting battery to work on electrical system

[Uncle Yaris]

Originally Posted by goku87

Does it really matter which terminal you disconnect whenever you are installing stuff? I've always disconnected the + but only recently for some reason I keep noticing everywhere that you should disconnect the -? Does it really matter?

Yes, it matters. If you disconnect the positive and accidentally short the wrench to ground, it can cause a fire or even an explosion (hydrogen gas in the battery - remember the Hindenburg?)

If you disconnect the negative, shorting to ground with the wrench won't do anything, since it's already connected to ground.

[AlexNet0]

Originally Posted by Uncle Yaris

Yes, it matters. If you disconnect the positive and accidentally short the wrench to ground, it can cause a fire or even an explosion (hydrogen gas in the battery - remember the Hindenburg?)

If you disconnect the negative, shorting to ground with the wrench won't do anything, since it's already connected to ground.

agreed, however this would only be if you touched the pos+ on the battery to a ground point on the car, regardless, good practice is to disconnect the neg-