Fast blinking turn signals

[Rickysnickers]

Here's the info. I have LED headlights, LED front turn signals, and rear LED taillights/turn signals. I installed two of the LED style flashers, that have a ground wire coming off of them. One is for the turn signals and the other is for the hazard lights. The ground wires are attached to clean metal.

Last week, I got under the truck and ground down some nice clean metal and installed several ground straps. I have;
1. Cylinder head to frame
2. Cylinder head to transmission
3. Transmission to frame
4. Battery to frame
5. Body to frame x2

I tested the blinkers with the engine off and the flash rate is normal. However, when the engine is running, they are flashing quickly and at an irregular rate. What is going on?????