I noticed that the wire looked a little small when I installed my harness so I ended up running a seperate wire on mine back along the frame to the battery in the trunk. At first I had the alternator wired as a one-wire setup, but changed it and used the wiring harness wire as the sensing wire for the alternator. Seems to help a little, but I still get some gauge bouncing when I have the headlights on, driving lights on, turn signal going, high amp fuel pump running, etc... I might go back and clean it up some by running the heavier wire through the bulkhead and back to the battery through the inside of the car.
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