you guys are getting WAY too deep into this.
if your radio has an aux input then just get the appropriate connector/cable to go from one to the other, if it doesnt then spend the $30 it costs to get an external speaker so you can bypass the radio all together, its not worth the hassle of trying to make it work.
there is no need for a diode unless there is an obvious need for it (say turning on your low beams with your high beams but not the other way around)
the diode in a painless wiring kit is so the alternator is always charging, if it sees a high enough voltage then its not going to charge but if there is a delta in the voltage out vs. in then it will put out power. another way to "trick" it is to put a light bulb in the line. FYI
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