You checked your grounds. I just had this problem where my head until is tied into the starting battery from the factory. But I wired all my amps and WS-420 to the stereo batteries. The head until would come on but the amps would fire up.
I forgot they where on different batteries so when a ground came loose on the stereo bank I didn't notice because the head unit was still turning on. And thought the WS-420 went bad and wasn't turning the amps on.
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