Hello, I need an additional power connection in the trunk (for radio). Have already read a few topics and also watched videos, how to put cables. But still I have questions. – How much does it cost to have something done in the workshop (very rough) – there are cable sets, which already has a fuse and does not need a great tool to connect? – Where with minus the mass? I hate to do it directly to the body, so simply to the minus po l the battery?! Have you done this before and can you give me tips? Please take pictures of it. Greeting