I have all four harnesses to tap the factory amp in our Passports with the premium audio. It looks like youngjyg cracked the code on adding external amplification but having the other reverse harness might benefit another application:
Spiral Audio WH-0009
Spiral Audio WH-1008
Metra 71-1722
Scosche HA10B
Just hit me up if anyone wants these, I went a different route and they're just gathering dust.....
Spiral Audio WH-0009
Spiral Audio WH-1008
Metra 71-1722
Scosche HA10B
Just hit me up if anyone wants these, I went a different route and they're just gathering dust.....