03 impala there is a factory installed amp all speakers. i am trying to find out if i can power another amp 760w pioneer form the amp that is already there? i have already put outputs for my RCA wires. can i get my power from the other amp and if so what color are the wires? please

make sure the speaker is not damage first...I don't think you can add an adapter to the factory radio...try finding another used amp at the salvage yard or eBay

They maybe external amplifier after stereo. Check fuse box
likely there is amp
https://www.instructables.com/id/how-to-bypass-the-amp-in-a-2004-impala/

notify pioneer about your set up

30-35 Watts @ 4ohms

On pioneers, i know that some of them, you have to twist the yellow AND red wires together on the power from your car. Make sure you are grounded. Radio fuse isnt blown, or any fuse on the back of the deck.

1- you need to provide a fused power wire from battery to amp
2- provide a ground wire from amp to car body or frame (be sure to clean off paint if connected to body)
3- connect your remote wire to your fuse box (16 to 22 gauge wire will be fine)
4- connect a line output converter which will allow you to use rca jacks (one side connects to the speaker wire in your car and the other to your rca jacks)
5- finish by connecting your speaker wires and rca jacks
if helpful please rate 4 thumbs up.

I had the same problem when I changed out the factory cd player. I finally found the problem was that grand am gt cars have a couple of amplifiers with crossovers in them for the speakers and the after market stereos put out sound that has been slightly amplified already and when you hook up your new stereo to the wiring harness your sending amplified sound from your stereo the the factory amp then to the speakers this sometimes messes with he sound and clarity of the sound. My car is 2002 and the factory amps are located 1 under the glove box and 2 in the trunk behind the carpet on the drivers side. The amp and crossover in the front is to split the signal for the door speaker and the tweeter by the mirror and the amp in the trunk is to split the signal for the two way speaker in the back by the back window witch if they are like my factory speakers have 2 wiring harnesses connected to each speaker. the only way I could get mine to sound good was to run new wires from your stereo directly to the speakers and bypass the factory amps. This may not be the only way to fix this issue but it was the only way I could figure it out. I hope this helps

i have self amp speakers one went out got fuse does not turn back on

This is the most common problem with self installs.The best thing to do is to get the car radio installation plug,it will plug into the factory plug for your factory radio and will give you a color coded pigtail to wire into that usually matches up perfectly with new aftermarket car radios.If the wires are already cut then you best bet is to extend the wires so that they are easy to work with hookup the power,ground,antenna and try dirrerent combos to isolate each speaker and label the wires accordingly.

Hi Have look at link below
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=2&woofer_imp=1