Problems installing sub in 01' Taurus. Searched, but no luck.

[JustStartingOut 10+ year member]

So I found lots of threads on putting a full system into a Taurus, but I'm helping out a friend from work who only has a sub+amp that she wants to add to her factory radio, not aftermarket HU. That's where I'm having a problem because I've done a couple amp+speaker+sub installs, but I'm not sure exactly what I need to do because she has a factory amp. She has no money really either, so if there's some $75 wiring harness, that's probably still a no go. I just need to know what wires to tap into for the amp remote wire, and if wiring the rear speakers to the input on the amp is the best thing to do there. If so, where do I wire them in at - Before or after the factory amp? Thanks.

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