72 rx3 coupe, having issues with the lights and blinkers, when I flick the right blinker both front and rear lights stay on and don't blink the high beam light on the cluster also comes on, also when I switch the lights on the headlights don't illuminate, I'm thinking I need to go through all of the earths, I cant find the right front light earth point in engine bay or a point in the loom where it comes out from? any help appreciated, the cars been off the road and stored for 27 years and I'm getting it going again.

 

Like you say, it is probably earth related. Check the loom in the engine bay on both sides, by the washer bottle and on the opposite side. Also check under the dash, there are a couple or three earth wires under there as well, close to steering column.