pretty much had the same probs when i got my truck painted earlier this yr.
grounds would be my guess too.
my tail lites were acting weird, even after i took the paint off for the grounds. my tail gate lights (1 ton) were not grounding properly threw the hinges with new paint everywhere, so i ran a ground from the first lite (there's 5) to the frame and all my tail lite problems disappeared.
prob got the only k30 with an externally mounted tailgate ground...
