Try reversing the polarity of the wires from your truck to your ballast. (Turn the plug over) I had to do this in my truck.
Yeah, In my Chrysler I had to use a capacitor to help regulate the voltage. Among the kits i have purchased I have found this to be inconsistent. Out of the three kits on my Chrysler only my low beams needed them. Even though the ballast looks the same something seems to be different in the internals.
I was talking to my friend about this who sells them, he claims his ballasts are digital unlike the one I had to install the capacitor on. He said my other ones are analog... I called BS, but I really dont know.
Has anyone seen or purchased the ebay ones with the barrel shaped ballast? I got a set for my dually, and they seem to work pretty good, they fire 98% of the time. The only problem I have had was they are not waterproof and I dont have any inner fenders. The company was cool about replacing the ballast for me since it died, but I dont think they would do it again. Another thing I liked about the company that sold them, they were based out of California, so the shipping was pretty quick as well as the return.
This is how to do the capacitor trick.
Note, the arrows on the capacitor point to the ballast.