Hello I have a 1979 Mercury Capri and I am going to replace the bulbs in the circuit board. I am aware that the 1979 Capri Has two printed circuit boards. My question is I want to install the bulbs and hook a 12 volt source to both printed circuit boards to test the polarity of the bulbs to make sure that they are lit BEFORE re-connecting to the wire connector. I have checked online and this forum with no avail. can someone draw or tell me how to attach the 12 volt hot and where to connect the grounds on the printed circuit board.