I`m work on my car now. How I can wire from the battery to the trunk, on this A4 2000.
Thats no hole, for I can run the power cable to inside the car.
Please help me.......
Thanks

 

u have to drill your own hole in your firewall
either take it somewhere and have them do it, so that way you dont drill into something of importance, or find someone who has one done and imitate theirs

 

No holes drilled method:

You open your ECU box which is in front of the driver under that black plastic cover at the very top of the engine bay. You thread the power cable through the ECU box down into the cabin under your steering column. You may have to punch a small hole in the rubber guard that stops water from coming into the ECU box in order to fit the power cable.

If you unclip your ECU and move it out of the box, you should be able to shine a light in there and see if under your steering column. Look for the DIY on audiworld.

 

Yes no need to drilling holes. I used the ECU box too on my B5 to wire my stereo amp.