Check the grounds at ALL the light housings. It may be more than that, but that does sound like a ground issue and it's the easiest place to start.When I use my turn single all the other lights blink as well as I cannot use the turn single with the windshield wipers on they just don't work
Rear taillight housings can have trouble grounding thru rusted screws or fittings. It's worse when they're in the bumper. I had to make ground wires and run them from the taillight housings to common/shared grounds on the trunk floor.
Sorry it took so long to reply, yes it does it in both directionsYou have a SHORT circuit. I suggest your other lights are grounding through the turn signals. BUT, your turn signal switch may also be where the short circuit abides. Do both directions cause this behavior, or only one?
Try disconnecting the turn signal fixtures, one at a time, first. Watch and see if one of THESE is the source of your woes. It probably won't be, BUT, when troubleshooting problems of this sort, one starts by eliminating each branch circuit, checking each component until the Problem is found, and fixed. Disconnect them at the plugs to the bulb fixtures, if possible. If not, then one of these may be considered a suspect.
See what happens, then get back to us here. I enjoy solving these sort of problem, FWTW.
I have seen cross over, where both sides blink, because of bad grounds.Interior lights and rear lights
Sorry it took so long to reply, yes it does it in both directions