Are your auto headlights disabled? If not, that's your problem. I blew a couple ballasts before I figured out I needed to disable mine. It seems that as you're trying to start the truck, the auto headlights are turning on at the same time, when the voltage is low from cranking the starter. That blows ballasts because they're trying to fire up when they don't have enough power. I disabled the auto feature and no more blown ballasts years later. I turn the headlights on after the truck starts, and I have the full-time DRL and fog light mods so those all hit at once too.