Red light issue on Kenwood KAC-8401

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Just swapped out an MTX Terminator amp and used the existing ground, hot, and remote wires. However, I have a mono output and left/right rca inputs. I ran a used rca cable for my 4-channel Kenwood amp and ran all new 18 gauge speaker wire to all four speakers. After more work than I anticipated, I have no sound and a red light on the amp. If I remember correctly, Kenwood amps light up blue when working correctly. I'm new no multimeter use and somewhat rusty in the way of newer car audio. What's the most effective and efficient way to troubleshoot my problem?
 
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