electric fault

Hello (help) I’ve recently bought a ‘98 Z3m roadster and I’m still getting familiar with it. On my way home this evening could smell burning inside the cab (surely it’s not the zed, and it’s someone having a bonfire?). Luckily my sister was in the car and pointed out the fire at my feet. After...

....I've noted that if left, my Z's battery drains down after 2/3 days. Haven't really spent time to try and find the fault as I've got a spare battery on trickle charge. Out for a drive to football on Thursday night, lovely drive. Really enjoy driving the Z when I had a light bulb...