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I would deff get a hold of a multi meter and check your wires. Are you using a after market radio harness as well? It sounds like your "hard wiring" your aftermarket radio directly to the factory pigtail harness. Its alot easier if you used a aftermarket harness basically plug and play.
You only need 3 wire to power up the aftermarket radio.
Yellow wire on deck harness - Power = 12V constant
Red wire on deck harness - ACC/Igntion = 12V switched
Black wire on deck harness - Ground = Ground on chassis somewhere (nissans for some stupid reason don't run a ground on the factory radio harness)
All other wires are speaker wires, illumination (orange) and remote wire (blue). You can also use a 9v battery to pop the speakers/check speaker wires after you find out which wires are hot.
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