2005 Ram Big Horn

He's right, on chrysler products you have to hook up the amp turn on lead to the power antenna lead.  If you're looking to verify the amp in the car, it is behind the glove box, high in the dash. If you look behind the glove box on the left hand side behind the air bag you'll see the amp. I've yet to be able to unplug the amp, so i just  get the speaker wires in each kick panel.

the factory plug doesnt have a power ant or remote turn on of any kind. i dont understand how the amp turns on without a remote wire but it does. i guess i will have to pull the amp and hardwire the remote. i remember hooking up the high level input and i tried to do it right behind the deck and it wouldnt work so i pulled the kick panels and tapped into the wires after the amp. the factory harness only has 2 sets of speaker wires (not 4). that doesnt make sense because the fade and balance work so each speaker only has one wire feed from deck to amp. i dont think they use common ground for speakers anymore.

is the factory amp located behind the glove box? maybe i can leave the factory radio in long enough to find what wire powers the amp and hardwire it to the JVCs amp turn-on. does that sound like my only option? maybe it has something to do with the in-dash disk changer.

PS-thanks for the replies.

I remember hearing one time that some of the Infinity systems have a different wireing scheme. I don't remember hearing anything specific, but i'd try to test out the wires with the factory radio.

The amp is behind the glove box. At least the last couple of 05 Rams i've done were there.

So did you get it figured out yet? The only thing i can think of is that the 4 wires going to the amp are like a High level input, but there should be a fifth wire that acts as the ground on it. If thats the case, then you could cut off the ends of some RCA's and hook it up that way to the radio.