I just put in a 6,2" touchscreen stereo in my truck everything works great except that the backup camera will work when the ignition is in the on position but if i start the truck and go in reverse i have no picture just the graph on the screen i get a good picture if i just turn on the ignition without started here is how it is wired the trigger wire from the head unit is wired straight to the backup light on the drivers side tail light the camera is wired with the ground to the to the body behind the tail light and i ran a positive wire to the fuse box to an ignition on I have been all over the internet looking for an answer to this problem a lot of people have this problem but there is no answer to resolve it anyone have an idea to fix this Thank you