I did find that my battery ground wire needed to be fixed because the insulated rubber was worn so i wrapped it with electrical tape.
"ground wires" insulated or not do not affect electrical continuity or functionality ... they just pose a short circuit risk in case any... live wires or component touch it ...
that said , adding layers of electrical tape does nothing to solve your problem... it just points to a great lack of basic knowledge in electrical principals and application which you need to learn
I think you summarized the whole issue...... "Luck is not what I need." you need cash to get someone to fix your problem
someone who paid to learn and spend years improving upon his knowledge to fix things for those that can't learn even with patient coaching