Current delivered by the vehicle alternator
Why limit the alternator to producing 105A when the load requires more than that?

So, allow the alternator to function with the "normal" regulation and it will cover the load as well as charging the battery.

If the engine is under-sized and cannot produce sufficient power then the alternator won't be able to produce full output.

Also, if the alternator is not driven at sufficient rpm then it won't produce its max output either