Alpine iva D310

[sealw98 10+ year member]

I have it all wire up , i'm running 2 dash ,2 door , 2 rear deck and 2subs. I have the doors and rear deck running off amp and sub off 1 amp per sub and the front dash is running off the radio. Everthing is hookup thru RCA's except the dash. the problem that I'm having is that only the right side of the dash operates the left I get no sound. I ran through the wires again and it 's hooked up if I tie it in with the right side both dash speakers work. I have checked balance fader and nothing, all other speakers work just fine except the front dash any suggestions?

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