vw beetle distro block

I finished installing a Polk MM12 in a sealed box I built, and a Hifonics TXI4008 for the sub. There was some wiring left from a previous self-powered subwoofer that I was replacing (not loud enough for the lady ), which included the power and remote wires.

Stock head unit.

The car is a 2001 (pretty sure) VW Beetle. Apparently there is a distribution block located underneath the dash on the driver's side; fused in the engine bay by the battery. I don't know if this block is used for any stock applications in the vehicle or not. The block consists of 4 or 5 (don't have the car here anymore, working off memory) posts: one is labeled 75 ohm, two labeled 30, one more labeled 30A; I think there is one more, however I don't recall what that one was labeled.

The remote turn wire is hooked up to the post labeled 75ohm. When the car is turned on, the amplifier turns on as well, and everything is gravy (sounds great, by the way). While the car is running, if you turn the radio off and back on, the amplifier shuts off, however it fails to turn back on. You must turn the car off, and restart the car in order to turn the amplifier back on.

How can I fix this problem, and does anyone have experience with the Beetles and their distro bocks (I assume thats what it is)?

Thank you for your time, and reading this lengthy post.

The car is dropping voltage as it runs, I would say.  Could be reasons for this since it now has to run aftermarket sound gear.  Or it could be dropping at that connection for other reasons.  Meter for a turn on connection that supplies 12V while the car is running under a load condition.  You may just need to allow the amp to stay powered on while the car is on, whether your listening to music or not.  It would pull very little power if there's no signal going to it.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.