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Hyundai Getz - Electrical fault? - Mature student John
Attempted battery change DIY style. I checked for written instructions before commencing and I've done this once before, however, I connected the battery the wrong way round and sparks flew.

I connected the battery correctly and the car starts and drives fine. However some electrics have gone now.

Audio, windows, internal lights, central locking.

What have I broken and what do I need to do to fix it?

New battery is a premium Exide with 540 cold crank start.

Any help much appreciated. J.