If you do the amp bypass, run a large wire directly from alternator to battery relay, you won't have to worry about the stock wiring carrying the load.
Battery relay?
You realize that all electrical loads are, by design, supported by the alternator when the engine is running. All your "trick" does is feed the battery direct, everything else still pulls off the stock wiring and now you've severely increased the load on the wiring from the battery to the fuse box. Prior to your "trick" that load came from the alternator output to the fuse box. This is a poorly thought out "cure" for a problem that shouldn't exist.
