2nd on redoing the install. It's mainly for a safety perspective. To each their own. Regarding speaker level install, Kicker requires a
speaker wire to RCA adapter. If you already have the LOC, that's fine. IMO, I recommend to remove the LOC, and use the adapter mentioned. It makes things easier, as you don't have to power and ground another unit (LOC).
To trouble shoot what's wrong, there's a button for speaker input. When using the LOC, make sure the input is set to "Lo." Try that to see if it works.
If you're going to redo it and use the speaker wire to RCA adapter, make sure the setting is set to "Hi."
One last question. What exactly is wrong? Are you not getting any signal? Is your bass knob not working?
Install tip; I like using wire ferrules vs terminals for the power/ground. With speaker wire, it depends on the amp. If it's a plate that screws down, I do like using flat terminals and soldering.