Originally Posted by BlueFireIce
No, everything can be maxed with just the headunit, I have to play music with little bass and turn the bass into the negative to be able to turn it up any higher (with the tube), and there is nothing to check with the wiring, as I said, I have gone over it 5 times since I found the problem, and went over it 4 times when I did the install, it is 100% hooked up right and all connections are secure, I might pick up some better splicing, or go full out and solder the wires together.
However, I am thinking as you said the headunit might be going into a protect mode, as I can not think of anything else, so I might be picking up an aftermarket unit and see if that cures things.
You have misunderstood what I posted, most likely due to a failure on my behalf to explain myself adequately. If you can turn the OE receiver up without the Tube connected without the unit turning off, then it most likely is not the headunit. It is not unusual to see someone install a Tube or any subwoofer for that matter, and go crazy with dialing in as much bass as possible, either using the bass level on the headunit or through any eq bands or bass boost built into the unit. At times, this can result in the headunit overheating and shutting down.
As the only time you are having problems is with the Tube installed, again I say check your connections. You have stated that you have already done this, so let me ask you how? A visual check or have you put a meter on the terminals of the FAST-9999 when connected to the headunit? What about the BTAH? Have you put a meter on this harness to check for a potential short?
If the Tube is powering on and does not share a ground with the headunit, your ground should be adequate.
One last question, where do you have the red power wire and the blue/white remote wire of the FAST-9999 connected on the factory harness?