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Intercom kit with gps Tibo

kosconcours

Big Wheel
Hello to everyone ^-^
I have put on an Intercom advance kit to my GTR connected with a gps Tibo A1200  .
My problem is when i plugged gps to the 12V  bike socket i can hear the engine running through the earphones.The wiring its ok because when gps powered with his battery everythink is normal.Any opinions???
 
sounds like a ground loop issue, or a poor ground. just going from automotive for knowledge. hope someone else can help be more specific.

Joel
 
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