Got my new Clarion deck installed and running, awesome!
Only problem is that my rear speakers are not working now

I trippled checked the correct wiring of my speakers, no problem there. I double checked the settings on my new deck, making sure the speakers weren't faded to the front or anything, no problem there. The only thing I can think of is possibly a faulty wiring harness? I unplugged and plugged the harness in three times until it clicked, making sure it was locked together tight. I can't for the life of me understand why my rears aren't working now, they worked fine with my stock deck, any ideas?