question about abs light

[aaronh33]

i have a 2003 s10 and just had the rear end replaced and since then the brake and abs light has been on. i know there is a switch or plug that is some where on the rear end or at least that is what everyone keeps telling me but for what ever reason i cant seem to find anything that looks like something should be pluged in or missing. also i am having a hard time figuring out what the plug is called so that i can get a new one or plug the one that is there in. this may make no sence but i figured someone on here may know what im trying to say.