Cant turn up the music witout the amp shuting off

HELLO THESE AMPS ARE FAMOUS FOR DRAWING ALOT OF CURRENT AND IF YOU PLAY THE AMP WHILE THE VOLTAGE DROPS FOR TOO LONG YOU CAN FRY THE AMP BUT AS FAR AS THE SECOND AMP NOT WORKING AS WELL YOU MAY HAVE A PROBLEM WITH THE RCA'S OR THE OUTPUT ON YOUR HEAD UNIT WENT BAD OR YOU HAVE A BAD GROUND CHECK ALL FUSES THEN CHECK THE GROUND WIRE TO MAKE SURE ALL PAINT HAS BEEN SCRATCHED OFF AND THAT IT IS CONTACTING BARE METAL THE ONLY OTHER OPTION IS FIND A FRIEND THAT HAS THEIR WIRES RAN AND HOOK UP YOUR AMP ON THEIR SUB IF IT WORKS THEN TRY IT WITH YOUR SUB IF IT GOES INTO PROTECT THEN YOU MAY HAVE A BLOWN SUB CAUSING THE SHORT HOPE THIS HELPS THERE ARE ALOT OF OPTIONS START WITH THE WITH GROUND AND GO FROM THERE

Check the FUSE to ensure that current is not cut off.

A six gallon universal style hott rod, is supposed to draw only 4 amps when heating. What you need to do is double check any other items running on that same circuit. Not uncommon for people to plug it in to outside GFI and then find out that GFI protected receptacle near sink inside is on same circuit, and they are using that for coffee maker, or hot plate etc, which will in most cases overload the circuit.
Shut that circuit breaker off, and see what else isn't working then do an amperage draw calculation to see if you may be overloading it. If no chance of overload, then you may want to re-check how you wired it in case of a short, or loose connection. If all that checks out good, then I'd look at the hott rod itself as the culprit.

Apparently you have tested the tubes on a tester and usually there is a pilot light that would not be lit if fuse was blown.

Common problems are bad jacks and switch contacts on power amp INPUT or INSERT jacks. Also circuit board cracks and bad solder joints are fairly common, especially where volume controls attach to the circuit boards.

More expensive things are things like fried speaker if volume was played too loud. An ohmmeter test of the speaker would tell if the voice coil has blown.

fuse blown. check fuse.

it could be a couple of things. a speaker could be bad causing the internal amp to shut off. or, the internal amp itself may be bad. i know the new kenwood recievers will say "protect" when something like that happens. then again if youre vehicle has a amp from the factory, the fuse could have blown or the amp could be bad. check all the fuses in you vehicle and see. you may get lucky.

you may have blown the out put chip in the radio

its the multifunction switch gone bad

i've dismantled my system found the top fuse had blown on the transformer also aligned the cd tray all works sweet now wahoo :)

its a short in the power supply but ist realy care?, whats the price of this unit?...good luck