hello i have a 1996 audi a4 Quattro with an aftermarket head unit installed. the front speakers are hooked up but the rear speakers are supposed to be hooked up with the stock amp. i cant find the correct wiring diagram for what i need. can anyone help me please to try and figure this out i have completely no understanding of the fundamentals on stereo set up.

 

It seems that the amplifier is not powered on. You need to connect the power cable of the amplifier to +12V.
Can you please take a photo to show me the wiring scheme of the head unit?

 

here is the picture

 

 

Do you have photos of the wiring diagram of the original head unit and new unit?

 

the original head unit was never in the car when i bought it so unfortunately i do not.

 

i think i may know what to do i found pictures online that were unclear to me, but after reading that i have to power the amp it kinda makes sense now. i will try it and see how it works out, pray i do not short anything.