I hear you - lucky for me that I've never had such a problem in any of my cars, but I know of others who have - the system as originally designed works perfectly - as long as one maintains the molex connectors to to death, as I do. The cars as offered were never designed to last beyond five years or so anyway; I submit that the wiring was 'adequate' for the intended purpose.
I had the odious task of creating and installing a wiring harness for a GTX back in the early eighties when I was a young punk - he had a molex connector/dash fire that wrecked everything - had to replace the windshield and dashboard - heavier gauge wire, OEM molex connectors, silver solder, and pure copper connectors did the trick.
Made myself some good dough on that job.
I have done the same thing to my wagon, and the clunker Fury in the avatar, that I drive everyday.