For clean, safe tapping into the fuse box.
Here are the best, verified locations to find ignition-switched power on your '04 Silverado. 1. The Best Spot: Passenger Side Fuse Panel (F26)
According to multiple Silverado owner forums, the most reliable and easiest place for switched power is the passenger-side dashboard fuse box.
Finding Switched Power in a 2004 Chevy Silverado (Easy & Safe Methods)
There is often an unused relay socket (upper left) that provides 12V key-on power.
Behind the plastic knee panel on the driver's side, near the parking brake mechanism, there is a relay block.
Absolute necessity to verify your switched source. ⚠️ Pro-Tip: Avoid Constant Power Fuses