Bought my 91 GT new 20 years ago. Took out the stock radio, amp, spearkers 2 weeks after in 8/91 for an aftermarket setup that i did myself and kept all original radio, amp, speakers and parts. Original wiring is left in place as i even ran my own wiring. I was thinking of going back to stock now... 20 years later and 20 years older... thanks for your pics. My stuff still looks and smells new as i pulled it out of storage and wondinging if it works still.
For those wondering where the stock amp is located and mounted. It is located under the dash just above where stock radio sits. I have a 6 speakers original main radio harness back there with another harness for power and such along with antena wire. These 2 original harnesses plugs into the stock amp, then another wire harness comes out of the amp to the radio with simular plugs. I did not have the EQ option so that may be different. Only used one of the main radio harnesses with newer radio for constant power, Key on power, ground, along with antena. I did not hack factory harness, even though my brother who helped me install this wanted to hack everything. Everything else i could write a book about my system so I will not go into that here.