Turn signal issue.

[ttoldcarbuff7]

I have installed turn signals using LED front bumper mounts and LED tail lights on both sides. I have a shaft mounted lever switch and have the flasher unit with the extra ground. Everything works beautifully until I start the car and then nothing flashes. Tried running it through the switch, through the battery. Ground through the body and to the battery direct. nothing changes. Why am I having such trouble with the engine running.