Electrical woes!!!

Cause and effect. That melt down effect may be considered common by some but... Considering the numbers/statistics, not true.
Regardless how it is repaired, same wire gauge and connectors or welding leads installed, the cause is still present. Might have been simply moisture and corrosion that comes with age. Might have been accesories pulling too much current.
A lot of times the actual cause will show itself after the power supply is improved,
wipers go on and off and on and off,
headlights go on and off and on and off,
blower goes on and off and on and off.
All of those circuits have thermal protection somehwere.
Good luck with it.