Welcome from Mississippi!
Very true, finding a mechanic worth their salt is getting harder. Just like what was previously expressed, I took my HD into the shop and they screwed up a maintenance all while being told by the "kid" working that if the computer doesn't tell him what's wrong he didn't really know where to start.
Sadly I have found a lot of the stuff that I need up needing to fix on older bikes (or cars/trucks/etc for that matter) is people's hack jobs to get it working and not fixing it right the first time...as it sounds like what you might be running into.
As several have said, spend your time and get to know the bike. There should be some wiring diagrams available and if i am not mistaken the older dogs shared a lot of HD parts. I have found a lot of bikes have stuff like a faulty wire or connection (or something simple like the start button had gone bad) and people just bypass it, I would start there. If you can either print out or take the screen out to the bike and start tracing wires. I usually work from the battery box out toward the controls and the starter. It might be necessary to take the tank off and trace where the wires go through the tube up towards the handle bars (where I find most of the problems). Just my 2c.