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Since you posted this in cars and trucks I assume this is a bose car system. Most bose auto systems have the amp physically attached to the individual speakers. This means each speaker needs the following wires +12v, 12v ground, + signal and - signal. It also means that the head unit cannot directly drive a non bose speaker. If you are replacing the speakers and bose radio the best thing to do is to run new speaker wires. You can reuse the factory ones if you can identify which ones are what...and that may be a pain. If the bose amps are ok and you want to replace the speaker you would need to leave them connected and wire the new speaker to the wires on the bose speaker that come from the bose amp. Depending on the specific bose system there may be an actual wire that runs to the speaker from the amp but on others the amp is directly connected to the voice coil leads of the bose speaker.
Fuses are used to control the inflow and outflow of electrical current. They are mainly used in speakers in order to protect them from being blown out. This is why there is a specific number of ohms on the instructions that it can handle. I'm sure there is somewhere. There are fuses in all high quality speaker systems. You'd just have to open the back up in order to find it.