1999 Dodge Ram

Electrical problem
1999 Dodge Ram V8 Four Wheel Drive Automatic 67000 miles

I installed an aftermarket head unit in my truck. Now when I turn the headlights on the dials do not illiminate. Also the passanger window doesnt work using the driver side or passanger side switch but the passanger side door lock switch does work. Any ideas?
June 18, 2010.

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