Stephen Clark alleges in his small claims court lawsuit ... he installed the equipment, along with remote programming, but she stiffed him.
Clark says he installed the equipment in June -- while she was under house arrest in the shoplifting case. He's also suing for missed work -- we're guessing for the time it takes to go to court.
Clark claims Lindsay owes him $1,180.
Lindsay could not be reached for comment, probably because she didn't hear the phone because her stereo is too loud.