Since your running a LOC make sure all your inputs are right. Pos to Pos and Neg to Neg. The Remote wire needs any 12v switch source to turn on which you have right. To determin the right Fuse size go with this. MAX RMS Divide by 14 (volts) = ams needed to power amp. For example. If you have a 1400w RMS amp with a vehicle that supplies 14v (focus does) you need atleast a 100a Fuse.
so remember. Watt/Volt=Amp
2013 Ford Focus BOOS[ST]ED
2010 Ford Focus "S"edan (11 Psi, GT28RS) - Sold
ROTM Nov '11 (2010 Focus S)