wiring for 64 impala

Want to upgrade my 64 Impala with new audio (headunit,Amp,subs,6x9. It has the the original ac delco radio with one front speaker in the dash. I am keeping the original radio in place and will install my new head unit(Pioneer)in the glove box. I feel comfortable the wiring for the new components that need to be installed. What I don't understand is how to make the connection from the stock radio wiring that's there now to the new head unit I need to install. I looked under the dash and it seems to me there are two connections into the present radio. One small BLACK/ White maybe 16 gauge (looks like it comes from the ignition) and another Black and green and a larger black wire (I think its the antenna). Can anyone tell me where these wires need to be attached to on my new headunit.

First off, don't start this project without a digital multi-meter. You will need it to test wiring to install your new one. Cars this old only had accessory and ground. It wasn't necessary to have a memory (constant) since the receivers had no clock or tuner presets. This is where a DMM is useful. You will need to test the wiring that you think is the power for the radio. This is the best way to go if you are not certain what the wires you listed above do. Find a suitable constant source in the vehicle that will be fused to power your new stereo. You may need to extend the wires from behind the stock stereo to reach the glove box. That is a start. Have fun!Big Al

Tks for the reply. A little more poking around reveled that there are two connections on the back of the stock radio. One is the power (small BLACK/ White wire) and the (GREEN/ Black) wire to the speaker on the dash. Both have adaptors or clip the push onto the back of the radio. So....back to square one....where do I attached to the new head unit?

The old radio is not going to have all the necessary wiring for the new head unit. You are going to be far better off running the new lines direct to the main vehicle ignition harness or the fuse panel.Top Secret, I can tell you but then my wife will kill me.

run all new wiring to the new unit. forget the old wiring altogether.

forbidden wrote: The old radio is not going to have all the necessary wiring for the new head unit. You are going to be far better off running the new lines direct to the main vehicle ignition harness or the fuse panel.

Please fuse your wires from the IGN Look for a Brown for Acc and Red for power Test with a DVM or since the car is older you could us a GOOD test light Its not like he could fry a BCM. lol Run all new speaker wire

It looks like this has gone beyone DIY to more of a professional job.  If anyone could suggest another site I could visit to do this job.....well that would be great. I don't want to get over my head with this......but I did get this old car to have fun and spend time doing....well this kinda stuff. So...new wire's it is. Now I need to find out what that really is all about. Tks for your input.

ijc, I tapped into the ign wire that plugged into the original radio when I was doing this. It works, but I would suggest putting a fuse between that wire and your radio. I am going to add my constant power wire today, I will let you know how it goes.

Do you have an older Impala? If so...is that maybe a 16-18 gauge Black and white wire attached to a connector plug to the back of the stock radio?