A little audio/electrical help please....

[az1103]

I hooked up a Zumo and an existing XM radio through the auxiliary behind the cassette player (triple Y connector). Both units are getting power from the the back of the front accessory power connector.

All works OK except that if the XM is on and the Gps is turned on the sound level of the XM drops significantly , if the Zumo is turned off the XM sound level goes back to normal.

No such problem with the cassete player or radio everything interacts just fine.

My first response was that maybe the Zumo draws too much power, shortchanging the XM unit but checking with a voltmeter at the XM power plug shows no power fluctuation when the Zumo is turned on or off.

 

Any Ideas out there before I start pulling my hair out????

 

Correction and update: The power sharing has nothing to do with it. It's in the sound out connection - apparently, unlike the cassette player and XM, the Zumo doesn't want to share the aux. connection. When the Zumo is turned on the sound of the XM mutes down. However, if the Zumo is connected through the front then nothing is heard from the Zumo untill the XM is turned off, then the sound of the Zumo comes right in! I have NOOOO IDEA what's happening.

Come on you sound experts out there! Speak up!!!