taillight/dashlight problems

i recently replaced my stock radio on a 99 rodeo now my dash lights or tail lights don't work well. I know it has something to do with the wiring that goes to the radio I just can't figure out the right combination....if anyone knows which wires I need to screw with please let e-mail me @ [email protected]

did you cut into the factory harness?

Yes we did cut into the factory harness...there is where the problem lies...can anyone help...