Finally getting to it!!! 1970 Duster 340

Did some odds and ends on the car today. Put limited slip additive and oil in the differential. Hooked up the throttle cable to the accelerator pedal and installed the toggle switch for the map light. I hooked jumper cables up to the car to check out the electric system. Looks like I have some electric gremlins to track down. Dash turn signal indicators don't work but front turn signals and the left rear function. Horn worked briefly then didn't then next time I tried it. Both rear lights are lit always. The left is brighter than the right. I hate chasing down electrical issues! Might be a bad ground or perhaps a bad switch. The engine did crank when I moved the key to start.