Whilst oragex's post above is correct - the recommendation is to remove the negative (black) connection first so if you do accidently slip with the spanner when undoing the positive (red) terminal you don't cause a short circuit with a cloud of sparks from a frying spanner near the battery. 
NB How true JoeNinety......... 
Quote:
Originally Posted by JoeNinety
Always disconnect the negative (black) terminal first.
Then put an old glove (or similar) on it.
(The reason for disconnecting the battery if swapping out the stereo is if you are disconnecting the climate control as well - this will cause an SRS error if battery is connected when you disconnect the climate control - you will then need VIDA or other suitable code device to reset)
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Last edited by ASt85; Oct 15th, 2020 at 10:03.
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