I have a 1994 318 convertible that has had a problem with the battery discharging randomly overnight. This problem has been going on for a while. Now the injectors don't seem to be firing. I disconnected injector 1 and checked for voltage, before I turned over the engine I had about 7volts, when I turned it over the voltage dropped to 0 and the engine tried to fire off. If you plug back in the injector the engine ceases to get fuel again. I'm wondering if the battery discharge and the injector problem are related, and what is the injector problem? I'm very confused!!!!!!