ok best to take it out and start again ,
1 black wire to good earth .
2 red to constant battery feed
3 yellow to ingnition live
dont worry about the illumination wire for now it will work fine with out .

As martian said 10-15 amp in the back is the norm it should say in the cd play what to put in . you can get connectors to plug straight in that take the guess work out of fittin head units if your not to hot with your wires .