The battery + cable on stock 97-03 GPs is WAY WAY too long, it follows a very roundabout path to reach the starter. I don't know if your trouble is that cable or another wire. But a modification that allows a much shorter cable would be a great idea in my opinion. Theres a lot of un-needed length in the cable and as such, theres a lot more of it that can become damaged. I probably woudn't spend much time trying to locate and remove a smaller bad wire if you have isolated the issue. Just run another wire.
