I'm finishing up my 84 cj7 rebuild and having some trouble with the blinkers. The right side the front blinks normal and nothing in the rear, drivers side nothing but an irregular "click...click........click...click", I checked the fuses and the plugs at the lights and plug on the column and replaced the flasher.??? I also have no brake lights but I haven't looked into the switch on that one yet.
I did replace the whole brake light assemblies, they only plugged in one way but I'll check with a test light. Was thinking of running a wire from the inside of the housing where the bolts that hold it to the tub to the frame to ground it
a cool way to check your taillights is with a test light. ground the test light to the bumper and with the test light grounded and your blinker on say, left turn signal, (to the bare wire) the test light will blink as your left turn signal, (through the test light). its a faster way to see what turn signal wires are which. another thing that will cause your turn signals not to work is the turn signal switch inside the column binding.
I had very similar problems with mine. Like Bagus said, check the wire loom.
Trace the wire bundle that runs under the lip of the drive side door opening. It will run up into a wide flat connector with about 6 to 7 wires in it. My problem was that the pins in the harness had worked loose. Even thought the connecters were firmly connected, the pins had push back far enough to break the connection.
Tip. If this is the problem you are having don't pull the connectors apart, instead use a small pair of needle nose pliers and push the wires back into the plastic connector. Long term solution cut out plastic connectors and crimp wires together or folder wires over side of connector and tape in place to keep them from moving.
Thanks guys I still haven't got a chance to mess with it the inlaws are in town. I did look at that connecter before at the column it did look loose but i thought I got it back together didn't think to check the wires going into it, will sneak off in the morning for a peak.