Jordan, Begin with a Bosch or similar horn relay. The source unit trigger will trip the relay which in turn will power the EQ and turn on the amplifier(s). All components must have a common ground. For testing purposes, bypass the factory harness and get your source unit positive and ground from the same battery or battery switch source as the amplifier. If you account for all positives and grounds on a few components, plus the source unit illumination and memory lead, you'll certainly get to the bottom of it. Good luck! David E.M.
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