You will need this harness to gain access to the rear output channels that all Harman/Kardon radios come with from the factory. Whether you own a Electra Glide with only two speakers and want to add another set or you are installing an amplifier and want your rear speaker output for signal input, this harness will give you what you need

works for 2006 and up Harman Kardon radios.This is the plug you need to gain use of the rear speakers on your harley touring radio. there is no need to pay the dealership hundreds of dollars to have your rear speakers working.
$30 shipped