Is the 2008 avalanche trailer brake controller wiring same as a 2005 wiring?

It's unlikely that the 2008 and 2005 Chevrolet Avalanche trailer brake controller wiring would be *exactly* the same. While there might be similarities, changes in models years often include modifications to electrical systems, including wiring harnesses, connector types, or even the location of the connection points.

To be certain, you should:

* Consult your vehicle's wiring diagrams: These are usually found in the owner's manual or online (sometimes a dealer may have access to them). Comparing the diagrams for the 2005 and 2008 models will reveal any differences.

* Check the brake controller installation instructions: The instructions for your specific brake controller will likely detail the wiring for various vehicle years and models. This is the most reliable way to ensure compatibility.

Don't assume compatibility. Incorrect wiring can lead to damage to your vehicle's electrical system or, worse, brake failure. Always verify compatibility before connecting a brake controller.