Mercury Sable Stereo Wiring Harness - AutoZone Order Mercury Sable Stereo Wiring Harness online today. Free Same Day Store Pickup. Check out free battery charging and engine diagnostic testing while you are in store. 1999 Mercury Sable OE Wiring Harnesses & Stereo Adapters Mercury Sable 1999, Aftermarket Radio Wiring Harness by Metra®, with OEM Plug and Amplifier Bypass for Old Radio. For Non-Amplified aftermarket Radio. Metra preassembled wiring harnesses can make your car stereo installation seamless,..