Got a 700bt used installed it had to repin RCA harness as PO remove ones he did not need.

Several problems

It sounds like hell hollow and can not hear main track only background if I fade it all the way to rear sounds much better but does not fade to rear?

Also have pick up a really bad hiss engine off or on no matter.

One more question one of the pins for iPod cable will no stay in connector any easy way to fix that?

Thanks other wise works ok

sounds like you need new harnesses, also is it a hiss or a whine, a whine could be an issue with the pico fuses (which has been covered quite a lot)