What would be pulling that maximum regulated amp out of the alternator? If not the battery, then it must be something else.Alternator max output is governed by it's RPM so you could have a fully charged battery and still pull maximum regulated current out of an Alternator with not a single ampere going into the battery circuit.
Blower fan, ECU, lights, etc etc combined?
Can all these components(excluding the battery) draw in excess of 100A from the alternator charge wire??!!!
Yes, of course. That was only a rough estimate. I'm pretty sure I indicated that in my post.If you wish to use sperate cables that is fine.
After all any multi strand conductor is exactly that, multiple cables inside one jacket.
It is not ideal to fuse them seperately IE two 50 amp fuses does not equal a single 100 amp fuse unless the impedance path thru both cables is identical.
Two cables are obviously not identical, so they carry different impedance(or resistance rather since we are talking about DC current here) ratings, so I would place the fuse according to each wire's maximum ampacity rating.
For our(my) needs a rough estimation is enough.
It is not ideal, but I think it will do the job. It's better to use the original alternator charge cable+fuse, while adding a new charge cable+fuse for the upgraded higher amp alternator. One good reason for that is that the sense wire & battery charge wire joins only few centimeters from the alternator down the wire harness. So, disconnecting the old battery charge wire from the alternator and adding a brand new one will bring disastrous results 'cos of the inadvertently disconnected sense wire, which will cause the alternator regulator to falsely assess the battery as zero voltage and put out the maximum alternator voltage output(15+ volts) I'm sure once we know that we can simply connect the sense wire to the new battery charge wire. But, it's kinda makes sense to me to use the old charge wire, rather than disconnecting it.
Why not use/leave alone something that was already there and can function as a reliable backup in case the new wire meets a mishap?