HELP! Lights problems

[toddy4.6]

Hello all, I'm an old member with a new profile and need some help. I think it's a small problem appearing major. I have done a search on the forums but didn't find anything.

2002 X5 4.6IS
140,000km

The car has been sitting for a while, so I put in a new battery and it fired right up and all warning lights cleared as they should. But my lights are all crazy acting.

The headlights are on, except for one low beam bulb. I can not turn the highbeams off. The signals and flashers do not work. In the rear, the taillights are lit up, and one reverse light is on all the time. One interior light in the rear is on all the time.

I checked all fuses, they are fine. I have no idea where to begin chasing this problem. I'm thinking a ground or a lighting module ???!!!
I've done a fair amount of work to this car so not afraid to do what I need, just looking for some support.

Trying to sell the car as I've just bought a Porsche, and want to rectify this issue before it goes for Sale.


Thanks for any guidance.