Hate, The HU, depending on the make and model could have default settings (lowpass or dual zone) after a power loss. But since you've already reversed the front and rear RCAs and tested the amplifier with known working outputs, that would seem to eliminate the HU and point towards the amplifier. The amplifier fuses should be multiple and exposed on the side. Double check the remote turn-on lead inputs on the amplifier. Reset the amplifier by lifting both the power and ground. Let the caps drain for a minute. Re-connect the ground first and power second. To isolate and check the amplifier without pulling it for a bench check, use an iPod or other portable device directly into the amplifier. This may only require a 3.5mm to RCA adapter. BTW, if your HU or amplifier loses ground while powered up, either may attempt to ground via the other through the RCA shields(even though RCAs are above ground). It's possible to fry the output or input RCA sections. So, have all power off as you are disconnecting or reconnecting things. Alot of the above is thin but just being thorough before pulling the amplifier. David Earmark Marine (Message edited by david_e_m on July 15, 2009)
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