help with amp wiring
Connect only the 12v wire on the amp with a thick wire to the battery. You already have that. You need to disconnect the remote wire from the amp and the splitter and instead run a new wire from the head unit to the remote terminal. This wire can be like 18 to 20 gauge because it does not need to carry a large current.
Make sure to have a fuse inline in your power wire right next to where it connects to the battery. If you don't have a fuse and the wire shorts out to ground, it is likely to set your car on fire.


