I have a 5 channel amp that I'm trying to wire up to the stock harness. I have tested all the RCA connections and swapped the sub channel to the front right channel. Its putting out the signal. I have speaker wire going from the amp in the back up to the front harness behind my deck. No audio. Amp shows no errors. Anyone had this issue?

Edit: trying to use the stock wiring going to the stock speakers to avoid running wire directly to the speakers..