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Don't just plug into any empty slot. Many fuses in the driver’s side box are hot at all times. Always test the fuse with the ignition off before finalizing your connection to prevent battery drain. To help make this guide better, let me know:

According to multiple Silverado owner forums, the most reliable and easiest place for switched power is the passenger-side dashboard fuse box. 2004-silverado-switched-power-source

This circuit is often controlled by RAP (Retained Accessory Power), meaning it stays on for 10 minutes or until you open the door after turning off the key. 2. Under-Dash Relay Panel (Above Brake Pedal) Don't just plug into any empty slot

Behind the plastic knee panel on the driver's side, near the parking brake mechanism, there is a relay block. To help make this guide better, let me

If you are comfortable splicing, you can find ignition power directly at the steering column.