Replaced taillights with LED lights/housings. Hardwired into original lighting after testing. After a few days I noticed that the left brake light only worked after turning on the left blinker. It quits working when the left blinker is activated again and cycles back in forth in that manner. All blinkers work. All hazards work. Parking lights work. Only other thing different from the right taillight is that it has the license plate light. Installed new EL12 flashers. Checked ground. At a loss as to what to do.