The thread I read on park lights with headlights on said there is a jumper not shown on most schematics from P to R to connect them with tail light circuit and not actually with headlights as it would draw To much for that circuit. Sounds right
The difference is Barracudas have L6 and L7 wired to R terminal.
Darts and Valiants have L6 wire to P terminal, which Dana's continuity test shows as disconnected with headlights on position