Cd play wires have been cut and dont know what the wires are?

One thing I learned as an electrician is to never expect a certain colored wire to mean anything specific. If you do not have an electric circuit tester get one and I'll explain to you what to do. First lets just say you're installing a basic standard cd player with 2 front channels and 2 rear channel outputs, and the factory system had 2 front and rear channels your wires are already in place and you don't need to run any new wires. Your new cd player's wires should be marked or you have an installation guide telling you what each wire does now you need to identify the vehicles wiring. You vehicle will have a ground wire, an antenna jack, a power wire that is constantly powered for the memory/clock, a power wire that is hot when the key is on to operate the player and 4 sets of speakers wire a positive and negative lead. Use your circuit tester to identify both power wires. Install your ground wire first or you risk shorting out or blowing the inline fuse if there is one on the main power wire to the player, next your antenna, then your main power, followed by the constantly powered wire for the memory. At this point your radio when turned on should light up, you can look in the trunk and identify both of the rear speaker wires to save you some time, you can figure out the front 2 after the rear speakers are installed by turning the fader to the front and connecting your cd players speaker wires to them there is a 50/50 shot so if you need to correct it. I would always recommend soldering wires together and using shrink tubing to shield them. Wires that are just twisted together or crimp connected can come loose and cause arcing from a poor connection which creates excessive heat and could potentially burn up your wiring or short out the radio or other vehicle components. good luck with your installation