Proficient sub stopped working

the brake lights and rear lights will be on different circuits, the left and right sides should also be on different circuits. They should not stay on, and certainly not al together simultaneously. You need the services of a proficient auto electrician, not a mechanic though.
Good Luck

Brake lights nothing to do with the stalk swiches, they will be on different circuits. If the wipers and indicators are on different stalks I would say that you should have your vehicle checked by a proficient auto electrician rather than attempt a repair yourself.

The sub settings for testing should be: Crossover frequency - Max; Volume - Mid; Phase - Normal.

As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay or not.

If you've got power then that's a good thing. It could be something simple as a broken solder joint or bulging capacitor.

You have not got your subs wired up poperly, End it fried the ouputs on the amp, Live end learn (Dude)

The power supply is working but it is possible that there is no supply to the SUB WOOFER amplifier. It is important to remove and open the unit to probe and confirm.
It can be failure of the inline fusible due to a faulty output driver.
Finally check the subwoofer using a AA cell.

Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.

sounds like the amp is in protection mode. try disconnecting the subs and see it the light changes to green. if it does then the subs are your problem. if the light was allways red while it was working then the subs may be disconnected inside the box or have gone bad. try using a diffrent speaker and connect to the amp.

Sounds like you're overloading the amp's ability to drive the speakers. Turn the gain down on the amp and see if you can take your volume higher. If you have an independent subwoofer output control on the headunit, check its setting and reduce it if necessary. Also, if you're wired in parallel, rewire the subs in series to increase the load on the amp.

I felt supid this morning.
I bought a high end cable for my subwoofer.... and it did not work but a regular RCA Cable did. When I went to put the cable back in the package I saw an arrow pointing one way, I turn the cable and it works great.

since it still thumps i suspect the speaker is ok, but i suspect you have an electronic problem in the amp. since it is a powered sup & has the ability to auto turn on it has electronic circuits inside, take it to a service center for an estimate