VW Amp no power fix with pics
First confirm that the connector to the amp has less than 12v at numbers 20, 21 and 23 on the 23 pin connector.
Remove the lower trim panel on the center console using a torx driver. The panel slides straight down.
Then, using either a test light or a multi meter, pierce the casing on the large red wire in the harness for the amp shown above.
If no juice or no continuity between these, keep going.
Note: the ground wires are connected the same way, so check for continuity on these too.
Remove the amp and the plate it attaches to by taking out the 10mm bolts and torx screws. Cut the carpet and liner under this plate to gain access to the goods hidden under it.
Reach under the carpet and pop all the connectors that hold the harness to the floor and pull the whole harness out from under the carpet.
The red wire is spliced under the floor into 3 wires and that connector fails. as shown below.
Cut the wires back until you get to clean copper(it may be a few inches or more)
Reconnect the wires and insulate with your choice of coverings. I used heat shrink connectors with a heat shrink wrap and wrapped that in e tape. I know it's overboard, but I don't want to be here again.
Check the ground wires, they use the same connections.
Note the motivator in the background
Then pull the wires back through, be sure it all sits on the floor in the groove provided, then replace the plate, amp(hiding the cut in the carpet) and trim panels.
Didn't take more than an hour or so and was a VERY inexpensive fix.
Best of luck!