Signal Dynamics XP Brake light Module install

I hope this is posted in the right place. Has anyone successfully installed the XP Brake Light Module. I read other posts that show the same problem I am having. Those posts are 2+ years old with no activity for 2 years. The XP system will work with the ignition on but not when the engine is running. I have used the same system on Victory and HD with success. I know it is connected & grounded correctly. I use it to connect to new accessory lights to flash 5 times each time I apply the brake. The accessory lights are not on otherwise. (The same setup as my Victory and HD) As stated, all works great when turning on ignition. The accessory light flash 5 times each time brake applied and the Brake lights works as normal. THEN, when I start engine, I apply brake and the accessory lights flash and the brake light works as normal ONLY 1 time. Then, I apply brakes again, the accessory lights do nothing and the brake light does not come on. There has to be something to make this work. Anyone have success?