I have 2007 pontiac g5 radio that not turning on...ive traced red/blk wire(12v) down and has power to radio. Question is...are there any other power wires needed to power up

Based on the information that you have provided. There's a possibility that there is a loose wire/connection possibly in the back of the radio. You would probably have to access the back of the radio and check the wiring harness.

their are 7 recalls on the 07 none are for an electrical problem with lighting system
http://www.pontiacproblems.com/recalls/G5/2007 and the following tsb from march 2010 is for flickering lights

• TSB #PIC-5073B NHTSA ID #10034409
  • Date Announced: MARCH 01 2010
  • Additional Info: How to Fix
  Summary: CHEVROLET/PONTIAC: VARIOUS ELECTRICAL CONCERNS. SIR LIGHT, IP LIGHTS FLICKER/INOPERATIVE, PARKING LAMPS FLICKER/INOPERATIVE, TAIL LAMP DIM/INOPERATIVE, TRUNK OPEN LIGHT, RADIO INOPERATIVE DOOR LOCK INOPERATIVE, NO START, NO CRANK. POSSIB
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ELECTRICAL SYSTEM:WIRING

• TSB #PI-0817 NHTSA ID #10047261
  • Date Announced: SEPTEMBER 01 2012
  • Additional Info: How to Fix
  Summary: CHEVROLET/PONTIAC/SATURN: ENGINE FAILS TO START AFTER ENGINE CRANKS DUE TO FUEL PUMP WIRE HARNESS CONNECTOR NEEDS REPLACING, WITHOUT REPLACING FUEL PUMP COVER ASSEMBLY (FUEL PUMP FLANGE). MODEL 2007-2010 COBALT, G5, ION. *PE
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ELECTRICAL SYSTEM:FUSES AND CIRCUIT BREAKERS

• TSB #PIC-4578 NHTSA ID #10022806
  • Date Announced: JUNE 01 2011
  • Additional Info: How to Fix
  Summary: EPS/STR WHEEL CONTROL FUSE (#19) OPEN. *KB UPDATED 10/04/07. *NJ UPDATED 8/7/09. *PE UPDATED 8/1/11. *PE
  
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• TSB #PIC3385 NHTSA ID #10020916
  • Date Announced: FEBRUARY 01 2008
  • Additional Info: How to Fix
  Summary: REPEATED PARK LPS FUSE OPEN. *KB (ADDITIONAL INFORMATION) UPDATED 4/1/08. *NJ
  

2007 Pontiac G5 Recalls CarComplaints com

sounds like the dimmer switch itself is bad that is usually the colporate.

you should have voltage on red when engine running? might be faulty inverter or altenator check connections or put a bulb tester on the altenator and see if it lights up ?????

you need to replace the left front door speaker

its tricky. its behind the engine. If you pop the hood and you go to the left side, look behind the block and it chould be about half way down or so. You should see the cap for it. I think that was a horrible idea on pontiacs part. Happy motoring!

Radio 12v blue/yellow + radio harness
Radio Ground brown - radio harness
Radio Ignition gray + radio harness
Radio Illumination green + radio harness
Factory Amp Turn-on N/A
Power Antenna N/A
LF Speaker +/- pink - purple +,- radio harness or amplifier
RF Speaker +/- lt. green - blue +,- radio harness or amplifier
LR Speaker +/- black - yellow +,- radio harness or amplifier
RR Speaker +/- red - white +,- radio harness or amplifier

Notes: If equipped, the amplifier is on the passenger side rear cabin wall.

if your truck still has the wire connectors for the radio harness then your best bet would be to purchase the plug in adapters from wal-mart or local stereo shop,it should only cost about 10-15 bucks and would clarify your connectivity issues.or get a test light and at least determine power & ground wires then run new speaker wire