The easiest way would be to let the lights either open or close all the way then disconnect the two wires from the motor and check for voltage across the two wires you disconnected with a volt meter or test light. If no voltage between the wires you are good. Need ignition switch in acc position while testing.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.