99.9% of people will always tell you run a fuse to ANY power wire that has to do with car audio.
That fuse is to protect the wire and if there is no fuse you will have a fire on your hands.
Now for the amp can you take a small jumper wire from the remote to the power on the amp and see if it clicks on.
That other .1 percent is people who think they know what they are doing but don't.