2003 Toyota Tundra OE Wiring Harnesses & Stereo Adapters Toyota Tundra 2003, Wiring Harness by Metra®, with OEM Radio and Speakers Plugs. For factory stereo. This high-quality Metra wiring harness is just what you need to replace your defective or aged factory wiring harness. 2003 Toyota Tundra Radio Wiring Harness | Advance Auto Parts Compare 2003 Toyota Tundra Radio Wiring Harness brands. Check prices & reviews on aftermarket & stock parts for your 2003 Tundra Radio Wiring Harness. Order your parts online or pick them up in-store at your local Advance Auto Parts.