P1 - NAV +12V Switched Power - Red
P2 - NAV Audio (-) - Grey/Dark Blue (do this one last though...the one in the magnum harness looked like it was maybe light blue and dark blue?)
P3 - NAV Audio Left (+) - Dark Blue/Orange
P4 - NAV Ground - Black/White
P5 - NAV Audio Right (+) - Dark Blue/Pink
the next step in the process is finding a way to cleanly get all the wires routed through the 2 windshield plastic pieces.
i ended up finding a pack of grommets of all different sizes at Oreilly auto parts. placed them in boiling water to soften them up and then cut into the top most piece just enough to get the grommet to place in there. Because the 395lm has a different style connector than the 590lm gps i had to make sure the grommet would fit over the small square part that provides power to the cradle(the small square is a little smaller than 1/2" )
i did have some extra space in the grommet. i was able to make the audio wire "thicker" with some shrink wrap. I will likely put some black rtv behind the grommet just to make up the difference.
final ram mount position
and it works great. did 400 miles down to Raton, NM to test it...and it worked flawlessly. paused my music that was coming in via Bluetooth. and told me navigation cues as well as did a fast beep interrupt when there was a hazard ahead or speed limit reduction required.
done and done. ready to ride.