Help with my battery relocation please

[blitzer454]

The current rating of the alternator has no bearing on the charging wire gauge size. Again, alternators do no pump current into the electrical system so it doesn't matter if the alternator is 60A or 500A the battery will only draw the current it needs until it is fully charged. There will be a little voltage drop across the charging wire especially when the battery needs charging and the wire will heat up but not significantly enough to do any damage to the wire. You can certainly use a bigger charging wire and it will work but why would you want to? You don't get the benefit of the slow charging and your adding unnecessary weight and cost to the vehicle.

If you decide to up size an alternator because you added components that require the extra current then yes you should make sure the wiring to those components have the proper wire size but the charging wire to the battery doesn't need to change.