2008's seem to be plagued with radio (wiring) issues. Many experience the same issues (all wired incorrectly in the same manner), while others just seem to have a hodge-podge of issues. I have yet to find a "happy" 2008 owner where the radio/sirius/etc are concerned.
If you want a resolution, you'll have to cut and splice. Do some searches. People have addressed this all over. Ric has mentioned some great shrink tubing to help keep everything water resistant.
Good luck!
_________________

2008 H220 Frenzy Edition VP 5.7Gi DP
2013 RAM 1500 Crew Cab 5.7 HEMI Tow Vehicle
Previously -
1993 Baja 180 Islander