Re: solenoid question
1994 is too new for me, but as applied to older motors, a red wire from the battery side of the solenoid goes first to a fuse, then into the main harness to feed just about everything. If that were not hooked up, your starter wouldn't even work. So, I don't know exactly what you are dealing with in this case.
However, to answer your question, the (yellow) wires go to the rectifier and a ?red? one goes from the rectifier to the solenoid as we were just discussing...probably via a screw on the terminal strip. One thing for sure, it isn't a bus bar.
If you have been running it without the rectifier connected, you probably have blown the rectifier anyway.