Abstract: A brake light attachment, for use with class II or III trailer hitches having a trailer hitch tongue receiving socket and an electrical plug connector having contacts for operating trailer brake lights and trailer turn signal lights, has an elongated generally rectangular shank with a first end dimensioned for insertion into the trailer hitch tongue receiving socket. A transverse bore formed through the shank receives a trailer hitch tongue retaining pin which serves to secure the shank in the tongue socket. A housing is mounted on a standard which is transversely attached at a second end of the shank and has a light bulb mounted in a socket. Light from the bulb is transmitted through a removable lens cover in the housing. The brake light attachment has an electrical cord having a first end connected to the bulb socket and a second end provided with an electrical plug configured for tapping the trailer brake light contacts of the trailer hitch electrical plug connector.