Reddit reviews Rockford Fosgate Single In-Line AGU Fuse Holder for 4 AWG or 8 AWG Wire
We found 2 Reddit comments about Rockford Fosgate Single In-Line AGU Fuse Holder for 4 AWG or 8 AWG Wire. Here are the top ones, ranked by their Reddit score.
Inline AGU fuse holder, platinum finish Accepts 4 AWG or 8 AWG wireRFFAGUSingle In-Line Fuse Holders
Yep, inline barrel fuse. Looks like this one
Amps use the RCA wires for the sound signal so you just need an amp and a sub.
Like the other guy mentioned, the blue is just a 12v signal. When the head unit turns on it just sends 12 volts and the amp turns on.
You'll need a short amount same gauge wire as the red wire to ground the amp to the chassis. The electricity needs some way to get back to the battery. I bet if you look around under the carpet to the side you'll find the ground wire bolted somewhere to the metal under the carpet or along the side.
Like /u/cancerous_anus said, definitely check along the red power wire, probably under the hood, for a fuse. If not most definitely put one in. Get something like this. They use the old style glass fuse.