Hi I am helping a friend install a aftermarket Radio in a 1999 Audi A6 Quattro, The problem we have first off is we are unable to find the Ground for the Radio, So I ended up grounding from the Battery, Then we started to hook up the speakers and suddenly the AC/Heater Control Stopped working completely, No AC or Heat comes on at all, Basically what I need to know is could this have happened while installing the speaker wires? and if so what happened? and what would I need to fix this? Also if anyone knows where the ground is inside the car please let me know I am in desperate need of this help as she is a great friend and counting on having a radio set up for her, Thanks for your help.
Also I have checked the Fuses in the Car all of them are in good working order.
Also I have checked the Fuses in the Car all of them are in good working order.