I'm getting a D-3 and installing it in 04 Ram 3500. I know I have to mod the bezel first. Truck has Infinity w/Nav that is OEM. Which harness should I use? Keep the Infinity amp or bypass it ?? Thanks for any help.

I used www.metraonline.com to find my parts. Crutchfield is pretty good about helping with that stuff but they didn't help me much when I called about my current install. Metraonline's website you can set your vehicle and find what you need from there.

You'll need a Metra 40-CR10 or 40CR-30 for the antenna.

I see only a 70-6510 harness that bypasses the Infinity Amp I'd get with a professional installer for more advice this is trickier to get information than my truck was.

There is another 71-6502-1 Harness but I don't know what it does.

Thanks for the info.

71-6502 is the reverse harness, not needed.