‘95 Impala SS .. Rear speakers not working

Icook2902 said:

.... any troubleshooting recommendations? A Noob here..

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First thing I'd do as a newb is find an ebay hardcopy or get get an online subscription to the FSM. Only AFTER that would I check the (very detailed) wiring schematics to ascertain whether the general rule applies that close to 80% of fellas doing their aftermarket systems have managed to pheuch up at least some of the wiring. Finally, I'd be trying to recall real hard whether I had noticed the rears weren't working WITH the existing, or, they just didn't make sound AFTER you replaced it. And of course while you didn't mention it, it's kinda important to know whether the replacement an oem radio or just something else aftermarket? And was it brand new or used? Lotsa variables to track down and weed out.

I figure you've done continuity checks between that adapter and the speaker ends, and / or at the actual output end of the unit and the speaker end. Did you get back there and check whether at least a faint 'unhearable' sound. And 'all rear' doesn't load the speakers up with least some overload static? I may have missed it, but did you answer whether there were rears BEFORE your first change?

I don't mean were there physically speakers in the holes in back, but instead whether any sound sound coming out before making any changes after you got the car. It just helps in root-causing. From the posts it sounds like it could be as simple as that aftermarket harness might be able to get 'plugged in', but ain't pinned right.