Hey everyone,
I'm running into a strange issue with my headlights and could really use some insight.

I have a completely new setup:

American Autowire harness
New headlight switch
New dimmer switch (replaced today)
All new headlight bulbs
Here’s what’s happening:

When I turn on the high beams, all four headlights come on, but the two outer headlights are very dim (reading ~5 volts). The two inner high beams are getting about 11.5 volts, which matches the reading at the dimmer switch.
When I switch to low beams, the two outer low beams light up fully, but the two inner high beam bulbs glow dimly (~3.5 volts at the bulb and at the switch).
To troubleshoot:

I replaced the dimmer switch today—no change.
I also bypassed the dimmer with a jumper wire to confirm—same issue.
I don’t think it’s the headlight switch—it’s supplying proper power.
Wiring setup:

Green high beam wire is daisy-chained to all four headlights.
Brown low beam wire is daisy-chained only to the outer two headlights (which have 3-prong plugs).
All headlights have their own ground wire, grounded to the radiator support.
I’ll attach photos of the lights in operation to help show what’s going on.

Has anyone run into this kind of issue before? Any ideas on what I should check next?