exfed750
New member
I’m looking for help in wiring two audio inputs into my J&M 2003cb handlebar unit. A little background: my RT is wired with a Zumo 550, equipped with an XM radio puck pumping music into a wired headset coming from my J&M 2003cb handlebar unit. The Zumo has 3 different music choices; XM, books, and recorded music on a memory card. The Zumo passes all audio out via a mini stereo plug on the bike mount. J&M has a mini male plug that connects to the unit via a modified 3 pin connection, and volume of the output is controlled via a rotary knob on the top of the control head. The Zumo has Bluetooth capability for phones and headsets, however, it does not pass XM audio via Bluetooth. To connect a phone through the Zumo and the J&M, it was necessary to purchase a Bluetooth adapter and a wiring cable to connect it to the control head. That cable connected the audio from the Bluetooth via a 3 pin connector (you have to disconnect the one from the Zumo (XM/audio)) and connect the new Bluetooth unit. Here’s the question I have (J&M was unable to answer this):
If I make a “Y” three pin cable to connect: 1) the original XM/Zumo 3 pin output & 2) the three pin Bluetooth unit output, is diode(s) needed to prevent the output of either unit flooding back and possibly causing damage to either? I suspect that the output of both cable is an AC audio signal similar to a wired telephone (DC voltage powering the line and an AC audio signal superimposed on the top.)
(I’m hoping someone with some electronics training, or experience with this can keep me from screwing up some very expensive electronics , and keep me happily cruising down the road, with music and my phone )
A Basic diagram of what I’m trying to determine is below:
If I make a “Y” three pin cable to connect: 1) the original XM/Zumo 3 pin output & 2) the three pin Bluetooth unit output, is diode(s) needed to prevent the output of either unit flooding back and possibly causing damage to either? I suspect that the output of both cable is an AC audio signal similar to a wired telephone (DC voltage powering the line and an AC audio signal superimposed on the top.)
(I’m hoping someone with some electronics training, or experience with this can keep me from screwing up some very expensive electronics , and keep me happily cruising down the road, with music and my phone )
A Basic diagram of what I’m trying to determine is below: