Advice? I'm surprised I'm the first to say it, at least on this board- Modernization, and a full one at that...both cars for a better price.
Seriously though, it sounds like you're the building owner frustrated with the current situation, and do you not have an maintenance contract? Or call only when needed? With equipment in the condition your worst of two is in, I'm surprised any licensed company or mechanic invests time enough to find the root cause. Constantly blowing fuses, controller parts shaking off the board (do you understand what an "short circuit" is? It's the quickest way to big trouble), and untrained people working on the equipment? Sounds like a recipe for disaster. But more than likely, you've heard this advice before.
And one last comment: Some states which have conveyance licensing prohibit unlicensed, unauthorized personell from monkeying around with elevator equipment. In the event of an accident resulting in injury and or death, guess who takes the heat?- You Henry! Not being a smart alec here, but an untrained, unlicensed person working on your equipment puts not just a few people at risk; 1) The next elevator technician who you summon, 2) The riding public, and 3) You.