Originally Posted By: Crapaddict
I would suggest to put LED's in the leads to the blue wires.
As LED's are Light Emitting Diodes, a diode's feature is that it allows the current to flow only in one direction. (towards the amp, in this case)
This way the empeg will have no knowledge of power on the blue wire if the ipod is up, and vice versa.
And as a bonus, you can mount the led's somewhere visible to see which device is powering up the amp. (or even both) grin


No LED will work at 12V without blowing up so you would need a resistor. If you wire it with resistors then you have to wire it in parallel so you don't resist the main turn-on voltage which means the Diode feature actually wouldn't work.