Need an Adult. Alternator Wiring Question. Non-OEM System

Just Send It said
Understood. Since I've got a 2AWG wire running from the rear battery to the firewall bulkhead, would a 125amp breaker be sufficient?

The distance is only 2.5ft from the alternator to the firewall. From the firewall rearward, it's the big main wire.

Just not sure what could handle that load with that large of a wire. Especially during starting.
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The starter would definitely pop that fuse, and a fuse big enough for the starter could still start a fire if there was a short. I meant to say as close to the bulkhead bolt as possible. So it’s only the alternator wire that’s getting the fuse, not the battery cable. Sorry.