Amp wiring, radio earth wire?

[Ben_SaxoForte]

I'm just finishing off wiring in my amp with a boss wiring kit, ive installed the live, amp earth wire, remote lead and the audio wires but have a long radio earth wire left and i'm a bit confused what you do with it? don't know if i'm just being thick but i've had a long day.... lol

any help please? thanks

[danny-vts]

power cable (red) from battery to amp
rca's (will have male connection ends) from back of headunit to amp
earth (black or brown) from amp to a metal point in your car
remote lead (thin blue) from back of headunit to amp
speaker wires from amp to speaker.