Don’t understand why it matters, you want relay power connected to battery.
Alternator supplies the battery.
Correct, and if you drain the new load from the batt will be constantly stressing the ammeter on charge side ( what really means is this load is sourcing the new accessory ), while being sourced from alt, this issue will be saved... as far alternator is good enough to source it of course.
The trigger for the relay is what flows through the wiring harness, and only requires mA, not amps.
Correct, the trigger is on original wiring and switches and you are saving them from loads, but the device to be sourced will be still needing the same load to work. The relay will still need to get correctly sourced just like factory did, on a new "path"
