If I hooked up 2 amps would I need to buy a separate battery?

Dual amplifier in my 350z, amps will not turn on PLEASE HELP!?

• I have 2 kenwood amps, one hooked up to 2 12" subs and the other hooked up to 2 6X9 speakers. I can not get the amps to turn on. One of the amps is brand new, and the subs and other amp where in my old car and worked fine. I have the system wired with a dual amp wiring kit from crutchfield. I have a power wire from the battery going to a distribution block, then 2 power wires from the block to each amp. The ground is set up with 2 ground wires going from each amp to a distribution block then to a good ground. I then have 2 power control wires going from the amps to the stereo. These two wires are spliced together into the power control on the back of the stereo deck. The aftermarket harness for the stereo deck uses the power control wire to power the 2 stock amps, but it will not power my amps.When I disconnect one amps power control the other amp has lights that start to flicker but it will not turn fully on. Cructhfield says that I may need to wire in a relay, because the stereo is not supplying enough current to power the amp. I tried this and it did not work. I also tried wiring the amps power control wires to a 12 volt source with a switch, but this still did not work. I also tried to wire one amp to the power control of the deck without wiring the harness to it but this even didn't work, and this is how your supposed to do it??? Also, I noticed that my power wire coming from the battery has 12 volts when not connected to anything, but when I connect it to the distribution block it goes down to 8 volts, I'm not sure if this is a problem. I am completely out of ideas and can't figure this out. Any ideas on what could possibly be wrong. PS: all fuses are good and the grounds are good. The only questionable thing is the power wiring droppingg voltage when hooked into the distribution block.

• Answer:

  The problem is most likely the low voltage. Either there's a "high resistance" connection or other problem causing such an excessive voltage drop. It could be the distribution block itself. Many (perhaps most) amps will not function properly with only 8V of input power.