I sell a lot of the 6 and 8ga wire around cables. How you wire it is important.

I think the poster was talking about the starter relay and termed it battery relay.

What size wire is the red coming from the battery and the black coming from the alternator? How is running power from either side going to impair the system?

I tell people, run the wire around cable, bypass ammeter and leave EVERYTHING else, factory wiring, in place.

Running a 50+ amp alternator with the factory wiring/bulkheads/ammeter is plain not smart. The bulkhead will eventually melt regardless of how clean any terminals may be.