I bought a pioneer AVH-120BT and have all the correct speaker wires connected to the harness that came with the stereo. When I connect the supposedly correct wires for power and turn the key into the accessory position the stereo will not turn on. If anyone would please give me anything I'd be grateful. Thank you.

 

Was this radio brand new? Did your old radio work? Did you hook up both the constant 12v wire, and the ignition 12v wire? (Kind of like two separate hots) in addition to neutral.
Hook up the radios hot and neutral wires directly to a 12v battery and see if it comes on.
if it does there must be a mistake in the wiring, bad connection, bad fuse, etc;

​​​​​​You probably just made a small mistake somewhere but I'm sure you'll find it if you just take your time and check everything over you've already done.

Let us know what you find!

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Check if you blew the fuse. Put a meter on the power and ground wires to see if you're actually getting power.