Do you guys have me on your ignore list??? The harness is available at Best Buy, Crutchfield, Circut city and a host of other electronics stores. It is a universal harness that says for Toyota trucks and it fits the Cruiser as well. It is a two part harness for the small grey plug and a larger plug and it hooks up to the TWO GREY plugs that went into the amp, which are all of the speaker wires except the rear sub. If you use the spare GREY plugs behind the stereo you are then using the stock amp. This will not give you as good a sound as without the amp as you are using the inferior amp as well as the amp in your new head unit. If you need the harness, go to Best buy and get it from the instal guys and ask for an explanation on its use. They make it very clear. Don't get it from the sales guys, they know s***. Now take me off your frickin ignore list.