There are a number of problems with this car

There are a number of problems with this car. 1. Battery is discharging when ignition is off. ABS lights are on all the time, I had sensors replaced and my mechanic is going to replace the abs module. On the 199 540i, there is a button on the signal light switch. This activates a display on the speedo, giving time, date, fuel economy etc. This isnt working any more. Lastly I notice a sound like static when I turn the ignition off. Sound like it is coming through the speakers even though the radio is off. There you have it. BMW electirical goblins. Any suggestions thanks.