If one was to upgrade to a 225A, 325A, or any other (extremely) high output alternator, how are you gaining any additional amperage output or draw by utilizing the oem cable? Upgrading the cable plus upsizing the fusible link for that specific cable is paramount to full utilization. Throwing various components in the mix without performing the necessary electrical calculations can be detrimental. In no way was I implying to upsize the fusible link capacity on existing, oem cabling or components.
because there shouldn't be anything sizeable attached to the other side, the only part you have to be concerned about is the charge cable from alternator output to battery positive post. everything else stock will work just as it was intended too and just like it did with a lower amperage alternator.. the draw on the alternator will not increase, the alternator will simply have less strain on it. Unless you add other 3rd party equipment.
the alternator will not get as hot because it is capable of providing the same or more output as the lower amperage alternator with less work.
the effect is opposite if your vehicle came with a 160a and you throw a 105a on it that alternator is going to get worked hard and it's going to get really hot, battery may not get charged up properly, lights may flicker, or any other variety of low power issue's.
the kicker is all the oem fuses and relay ratings, wiring gauge, etc is all the same regardless if your vehicle came with a 105, 145, 160 or more amperage alternator.
adding heavier gauge wiring and grounds is of course a good idea (pre-fusible link) but is not a requirement.
and again 3rd party upgrades should not be attached to the factory wiring unless they are low draw and do not exceed the fuse rating for that particular system
if you are adding a ham radio, radio amps, ac converter, light bars, yada yada those should all be directly attached to the battery positive post with there own dedicated wiring, matched fuse rating (per device) and grounded to the frame at the closest possible location. because any fault will follow the shortest path
adding a 400w light bar to the factory lighting harness is just asking for it.......... same for anything else requiring more power, the factory harness was not designed for that.
