if you tried another speaker and there's nothing, then it's not the speaker. you could have a bad RCA between the HU and the tower speaker amp, or you could have a bad wire from the amp to the tower speaker. try switching speaker wires at the amp and see if your R speaker plays. if it does, then chances are it's the L speaker wire to your L tower speaker. if it doesn't your amp isn't sending out anything so move on to the RCA's from HU to amp and check those. make sense? make sure all the RCA connections are good, clean and solid. oh, also check your fuses on the amp. good luck!
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