For the mach 460 systems there is a different wiring harness to connect a aftermarket head unit ( stereo ).. Walmart sometimes has them if in stock, otherwise any car audio shop ( stereo shop ) best buy, etc will have the harness that you need. i believe that particular harness goes for around 15 bucks. If you don't have the right one, you won't get any outputs. keep in mind, it looks the same as a regular harness but if you look its color coded differntly. let me know how it turns out.
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