ABS light on


Recently i bought a 2004 ford mustang v6 with the 3.9 i think maybe 3.8 and it has the abs light on when i go to scan it their is no connection i checcked the fuses and they are good which made me think it was the abs control module its self i replaced it with a junk yard one do you think the junk yard ones bad and if its good what other things can i check ps going to wrecking yard to go grab another one tomorrow