the 'under gauged wire'?

[L05edSS]

i got a 86' ss, i recall seeing posts bout a factory wire that can and has caused probs. IDK where to begin with a search on this and i've tried and got everything BUT. am i hallusinating & FOS? i got a upcoming shop deal bout to go down after j4 and its gonna be my last for R&R. could also be 1 of those mandela effect things cuz i know think seen somewhere & wasn;t a concern at the time, almost wanna say its in the ignition area. tia

 

[78Delta88]

Im thinking brown wire which initiates the alternator and is sense wire for volt gauge or idiot light. The next other I can think of is the green which if I remember correctly powers the electric choke.

The pink fires the distributor and 14g which in reality could be 18g and not cause an issue. The other lines mentioned are not that forgiving when corrosion or damage increases their resistance.

The sense wire to the alternator connects to the starter it is a 10 g if I remember correctly. If this corrodes or gets damaged can cause issue to charging system.

 

[Ribbedroof]

Are you thinking of the fusible links at the starter? They are undersized intentionally as a safety/circuit protection item.