E39 Multi Electrical issues

I've read most of the threads on this, my issue(s) are no highbeams (low beams stay on with switch off and key on) directionals, dash lhts, flashers, or warning buzzers (Lhts, key left in...etc) . so far have changed the ignition switch and battery. a few times I disconnected the batt and reset the problem but no more. anyone have any other options with this problem.

dealer tells me he thinks its a LKM

dealer tells me he thinks its a LKMSounds like it