2003 Subaru Forester Wiring Harness - Main - Subaru Parts Deal SubaruPartsDeal offers the lowest prices for genuine 2003 Subaru Forester parts. Parts like Wiring Harness - Main are shipped directly from authorized Subaru dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. 2003 Subaru Forester OE Wiring Harnesses & Stereo Adapters Subaru Forester 2003, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug. For aftermarket stereo. Metra preassembled wiring harnesses can make your car stereo installation seamless, or at least a lot simpler.