Assuming that everything worked before the start of the upgrade, it sounds as if you may have the speakers wired improperly.
Another possibility is most 12v stereos will power up but have no sound if the speaker wires are shorted out or a speaker is bad.
Last thought, is there a separate A/B switch or headphone jack?
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2014 F150 SC/4X4/5.0/3.55/Equal-i-zer 12K/Ride Rite Air Bags
2017 Jay Flight 24RBS Fiberglass, 15K BTU A/C, Thermal package, Alloy wheels
Goodyear Endurance Tires, Morryde CRE-3000 w/Wet Bolt Kit and X-Factor Brace.
(ordered 5/9/16, arrived 10/17/16, brought home 4/14/17)
2005 Trail Cruiser TL-26QBH (sold)
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