yeah, i let best buy install a head unit for me before because they did it free when i bought the unit... they grounded it wrong and every so often it would surge and blow all kinds of electronics, i went through 2 alternators before i figured out the problem

anyway, when you install it, id start by taking a speaker from somewhere else and wire it straight into the wires coming out the back of the head unit so make sure youre getting sound coming out there