Not being familiar with that system, what is supposed to happen when the switch is rocked either way?
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In the forward position, all speakers are off. meaning (radio, CD/MP3, AUX and CB) is played in the headset only.
In the centre position, the radio, CD/MP3 player or the AUX is played over the speakers while the CB is played only in the headset.
In the rearward position, the speakers are on. With a SPKR switch indicator lit, the radio, the CD/MP3 player or any AUX and CB are played through both the rider and passenger speakers. When the CB gets a signal every thing mutes and the CB is played over the speakers.