Red82GT, Pre-1986 cars require a heavy duty power wire for the alternator because the factory wire can't handle the extra amperage.
Check out
www.pa-performance.com
They sell the wiring kits for the 3G alternators that you will need and also that IMPORTANT power wire.
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'82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust.
1988 GT...T-5,bone stock