W116, Body and Interior Specific Aid

My gifted 82 300d seems to have cancer of the electrical systems. First windows, then blowers and heat/cool, now locks. Where do I start looking (Seems to originate in the panel between the seats)? Is this too much for a mech head girl with no time and no garage in a cold place? Car came from my brothers estate, know he replaced a lot of engine parts, hate to dump it, but need to be realistic.

My blower stopped working. Sometimes in the past when I restarted the car, the blower would work again. Recently I replced the ignition module, however the blower was working before and after the repair. How can I be sure the blower motor should be reoplaced before I buy a new one (appears they are expensive - $416).

How do I disconnect, turn off, or otherwise disable the burglar alarm in my 1985 300SD ? I had to go through deep water (8"+) at slow speed. Shortly thereafter, when I turn on the lights at all, the burglar alarm goes off and lights flash. This is embarrassing, at the least, to drive at night, so presently I have just parked it in the garage until I can solve it. I tried the driver door key lock/unlock - no difference. After setting over a week in my garage to dry out completely - no difference. I live in rural N.W. Indiana and there is really no need for the burglar alarm.

recently i was having problems with heat coming on when ac should have,mostly heat.ac works well.changed monovalve from mercedessource though old one was good,no change.got a used solenoid from mercedessource and then i only got cold,minimal heat.unplugged monovalve still cold even in defrost.whats the next step.aux pump??