adding/disconnecting amps

Hello all, I'm selling my truck so i disconnected all the audio equipment i had in there. I disconnected two amps and my subs from under the back seats. I left all the wires in there just taped them off now the door speakers aren't making any sounds. I'm hoping i just made a rookie mistake...

We all know the the ccorrect way is to disconnect the neg on the main battery, and connect it when the new amp is connected. Many times disconnecting the main battery can erase trip counters and some car computers may need an idle learning process if disconnected. Maybe some of the most...