Running wires from ON/Off switch to alternater.

I thought he was talking about the batt wire from the alt. sorry for living - vitamin c. I see now that he and you are talking about the field wires. why would you need to change any thing to relocate the battery to the trunk with a cut off switch beside running your long cable to the trunk and through the cutoff to the battery? all the original wiring for the alt. should stay the same shouldn't it?