No power anywhere......

Check them with a load that is "turned on?" You may have missed something if that's the case

"Let's say" the bulkhead connector is the culprit, but it's intermittent and make / no make. Your meter does not draw much current. You might check at the ammeter and have power WITH NOTHING turned on. But as soon as you turn anything on, lights, ignition, the connection "breaks" and no power.

Tell ya, LOL this "troubleshoot by remote control" isn't always easy