I have a 2003 H2 Hummer that I want to install an aftermarket radio. Can I reuse the factory wiring harness to connect the new radio to my H2 when I remove the old radio or do I need to buy a new wiring harness?

 

Depends on what stock radio you have and what aftermarket radio you are installing. You need to check crutchfield and the other big sites. Usually they have tools on there and will tell you exactly what connectors and adapters you need to full functionality