shake this 10+ year member
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If you are using the factory HU then you MUST use a low level input. This can be a stand alone unit or be built into the EQ. Most EQ's don't have this option so I hope he installed something to convert the high level output from the HU to low level inputs so you can run RCA's. If not, I'll bet this is your problem with the amps cutting off. I still think you also have a loose connection.
