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The primary locations for grounding in a 2004 Chevy Silverado are two wires connected to the battery's negative terminal. One wire links to the engine block, while the other connects to the frame rail. These are reliable grounding spots due to their solid metal construction. When adding a new electronic accessory to your truck, it's best to ground it to the frame if feasible, or to the body with a sanded spot of paint if the frame is inaccessible. If necessary, you can always ground the accessory to the battery's negative terminal using the wire provided.
The ground wire for a 2004 Chevy Silverado can be found at the rear of the engine on the right side, near the firewall.