head lights pulse after bypassing my bulkhead

Now that we know the fix.

The IGN feed to the regulator provides both sense voltage, and the feed to the field. A poor connection results in instability. If the IGN is lower than desired, the field is energized, that current creates additional drop. The regulator is a hysteretic controller, some call it bang-bang, or ON-OFF. The added resistance increases the hysteresis, that is the voltage dead band, for regulation, resulting in flicker.