there really never were grounds , just the cast housings have to be able to make it to ground through the paint , you can add ground wires from the housings to a good known ground spot on the body . Start testing for power , you can start @ the light switch & turnsignal plug at the base of the column or work from the other end tsting for power at the light sockets & working back towards the switches , if you have an Ohm meter you can test the housings to ground on the battery too