08 dodge ram amp trouble

I have a 08 Dodge ram and I installed a phenoix gold QX900.1 amp and 2 kicker cvt 12's.  Feel free to flame me lol but i still have the facotry head unit with a step down installed on it.  The problem i'm having is when I have the volume past 25 or so the amp will act like its going into protection but the indicator light on the amp doesnt go red.  below 25 it works fine and beats hard.  the subs are SVC and wired directly to the 2 channels on the amp @ 4ohm.  however the amp is 1ohm stable and i know there are 2 speaker jacks outside but they are wired mono inside the amp.  Ok here is what I have tried so far.  I switched the amp with another amp i know works.  it did good for a day or so but then instead of cutting out it blows fuses.  so i took BOTH amps and put them into another  vehicle and they work fine.  I traced all my wiring and even re-did the ground and still having the same problems.  I bought a JVC head unit with amp pre-outs to make sure that wasnt the problem and with direct rca to radio and amp still had the same problems.  Someone had mentioned that 08 rams need a voltage regulator for the radio but i havent found anyone who can confirm this.  Anyone have any suggestions?

What is the input sensitivity of the amplifer rated for ? You might be exceeding the input voltage of the amplifier.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA

 turn the gain down on the LOC

use only ONE of the speaker outs to run the amp. So just tap into ONE of the speakers and split the RCA out for your amp... almost 4v at 35 the max level on the factory stereo.

i forgot that this truck also has a factory subwoofer.... u might wanna use THAT output to run your bass. the woofer is in the lower center console.

Forgive my ignorance  but how can i tell which wires is for my sub output?  honestly i didnt even know i had a factory sub.  i thought that was only in the infinity systems.  as for the split i can just use a y adaptor at the convertor to split one output to two rcsa for the amp correct?  input voltage btw is 10-15.5 v and the gain and bass boost is turned all the way down.  Thanks to everyone for all your help !

HERE Is the colors for the truck..i know it says 2006 ram, but its the same on the 08. Use a y-splitter as you said.