odd electrical gremlin help required

[green A8]

I got my project A8's insurance sorted thanks to all your thoughts and suggestions in my other thread

The next phase was to arrange the MOT. Not a problem all that was required was a quick 'phone call to sort that out. I nipped down to our local filling station and bought 40Litres of nice fresh petrol for the car and threw it into the tank.

Then came the problems, I'd taken the battery off the car to give it a top up charge, as the battery is new it didn't really need this but as the car has been sitting idle for a few weeks drying out the interior fitting new discs and pads ect I thought it wise to err on the side of caution. I re-fitted the battery and tightened everything down as you do, then came the start up. The engine fired up instantly BUT the battery charge light stayed on! Bugger thinks I. Turned the engine off checked out everything I'd just done just in case I'd done something wrong. No problems were found. So, I restarted the car, and that's when odd things started happening, firstly the sunroof fully opened itself, without me touching the switch! Then the steering wheel moved, again with no input from me, and then the charge light went out. Good news? No, not really because it now stays out and refuses to illuminate at all even after disconnecting and reconnecting the battery several times. Would this be an old fashioned bulb or are they LEDs on the 98 PF cluster? That remains the state of play at the moment, oh and the battery is now back on charge!

The alternator was replaced with a 'reconditioned' unit less than 800 miles before the car was laid up, not that that means a lot, I've known some cars get through half a dozen alternators in as many months. I'm just wondering if perhaps this could be some sort of relay or fuse fault or maybe an earthing issue. Vag Com can find no new fault codes. So, before I go ripping the car to bits (again) Any ideas that could point me in the right direction Ladies and Gents? I'll await your replies with interest, thanks for reading this, sorry I droned on a bit.

Paul.