Headlight, Turn Signal, Reverse circuit mystery

Hello!

I have a 2007 DC SR5 4.7l 2wd with 243K miles on it. I have a bit of a mystery on my hands which I need help diagnosing. I recently removed my old head unit (ATOTO A6) and replaced it with a new Joying 10.2" unit. Both units used harness adaptors, not cut and splice. I don't not know if this is related, but it is an apparent antecedent.

After this, my headlights would not turn on, my turn signals would not work, and my reverse circuit does not work. My hazards work just fine, and light up the blinker lights on the dash. When the turn signal stalk is activated, it does not turn on the blinker lights on the dash.

Using a multimeter, I pulled LH-IG (7.5A), TURN-HAZ (15A), MET-B (5A), MET (7.5A), ECU–B1 (7.5A), ECU-IG (7.5A), ACC (7.5A) and checked continuity and all were good. Discounting the reverse circuit (as it doesn't intersect Headlights or Turn Signals), it looks to me that they intersect at the flasher relay and the stalk.

Since I was limited on time, and since it is an old vehicle, I purchased a replacement stalk and flasher relay. I replaced them one at a time and there was no change. I replaced both, and there was no change.

Using a back probe, I noticed that pins 6 (left blinker from switch) and 7 (right blinker from switch) on the flasher relay plug (J10?) were both showing 12v constant whenever the blinker was switched left or right. When the plugs were unplugged, no short between the pins was found. No short between the pins exists when relay module was unplugged. Could it be that both relay modules are bad?