Join Date: Aug 2016
Location: Northwest USA
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Sounds like the OP has it hooked up right, as long as his Radio is not connected to a fuse or wire that is 12V Constant rather then Switched....
THe Acc on the impala is at the radio via a Data line, So unless a person buys a Aftermarket Wiring harness that retains that. The wiring harness would most times have an extra Red length of wire to make a connection at the Fuse box... The higher end Wiring harnesses will have the RAP ACC converted for use. So then it is Wire to Wire and no extra Acc wire because it is included.
About the amp being left on. IT could be that you had it hooked up right however if you don't use Spade connectors to connect your wiring to your amp if they are type with Screws and not push on. You can at times if not careful get a wire that can connect with a stray wire...
Also depending what type of Harness was bought it may or may not have Onstar or Steering wheel controls and the safety chimes for when you keep your keys in the car.. At times people just buy the one from WalMart that does loads of years from like 94 to 06 and so on. There are a lot of if and buts, What matters is that it works for the End User the way they want it to work.
Most times there is no fuse between the Radio aftermarket harness. I always add a fuse at the radio (Can be a bad idea because of how hard radios are to get out.) However because there is no protection between radio and amp Remote Turn on, I connect one so if it was to short to ground it don't kill the radio or the amp; it would pop the fuse. Most other fuses behind the radio is done by the Car and radios have them built into the unit or offer fuses on the radio side harness. Any power to anything should be fused. Also Main Power wire from Battery to the Amp should have a Fuse within 18" of the Battery, closer the better...
It isn't what you Drive that matters, It is how you drive it.