Where is the other end of that ground connected to? Use a rear strut tower nut / bolt or seatbelt harness nut / bolt - CLEAN any paint / residue / rust off of the surface to be used as ground and sand / wire brush the ring terminal connected to your ground cable before tightening it down. Also, The RCA cables R&L need to be connected to the R&L INPUT of the amp & The sub out / or rear output on the head unit. (use rear out if the HU doesn't have a sub out), Next - Disconnect that remote bass knob for now, you do not need that. Also CHECK those fuses on that amp, the inline fuse @ the battery, & Any / All fuses @ the head unit. Connect the remote turn on wire to the solid blue wire on your head unit, and make sure the settings in your head unit are set so that the SUB-WOOFER output is ON. Can you verify that the rca cable you are running to your amp actually works by hooking them up to a home stereo & DVD / CD player just to eliminate that possibility? Take a pic of your grounded to your vehicle - end of your ground cable connection, and also what you have going on in the dash behind your head unit with all of the wiring / connections & post or just make another vid...