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The aftermarket alarm installers put in a black relay about 1 inch diameter. it should be right near the steering column, there are a couple of heavy wires and two thinner wires, , remove the relay then splice the wires back together with the colors matching, this will eliminate the starter disable feature. Remove the black box under the dash and any wires that are connected to the car's harness , they usually are scotchlocked on and you can just pull them off, you may have to remove the left kick panel.