Yes!! The top picture with the yellow wire isn't connected to anything.. I'm pretty sure (via the help of other vanners) that it was once connected to a Tach that I installed many, many years ago..... I totally forgot about it... until vanners suggested the tach which reminded me.
As for the bottom wire... okay... I will let it be... I can't figure out where it would get connected to the alternator, and since it hasn't been connected for YEARS, I guess no sense worrying about it... particularly since there are 2 batteries/isolator/etc now and all is running well.