Aftermarket radio help

Alright guys I just finished installing a aftermarket head unit in the glove box of my 78 Lebaron. Don’t freak out the glove box was already cracked n some heat gun persuasion to the air duct and it’s completely hidden with the glove box closed. Still need to trim n polish for final assembly (waiting on new speakers).

But my issue is I have my rear speakers wired in but no sound..? I hooked positive to positive per wiring diagrams. .Speakers worked with orig radio tho n now nothing.. radio...

Aftermarket radio help
Author: TheSkunk