Friday the 13th: The Series (1987)

S3E7 Hate On Your Dial

Johnny accidentally makes a huge mistake by selling a box of junk to a neighbor with a mental disability without verifying the contents. Among the discarded items is a cursed antique car radio. The neighbor's brother, a car mechanic with racist beliefs, discovers that the radio can transport him back in time when it’s smeared with the blood of a murder victim. He intends to go back to the 1950s to stop his father from being arrested and killed by taking revenge on the black lawyer who was involved. Johnny and Jack, clinging to the car during the brother's second trip, are pulled back in time with him and manage to thwart his plan. In the end, the brother is mistakenly burned at the stake by his father and the KKK, who believe he is collaborating with the very lawyer he wanted to kill.