Bulkhead wiring/fusible link questions

Could be a connection to insure a good feed to the field.
Putting your new wires in parallel and leaving the oriignals will work the same as now (but with less resistance).

My guess is the voltage in run yis from the current going to the field windings in the alternator, and a little to the ignition. If its 11 at the battery, there's no drop due to resistance downstream. Here's what I meant by drop. For example, if its 12 at the battery, 12 at the relay as 11 at the bulkhead, then there's resisantance between the relay and the bulkhead.