How can I make my TT lights flash unhooked from my truck?

SoundGuy wrote:
Good grief, what's all this talk about a "generator" and "if" it works. :h

I think you missed the post where he said it was a cargo trailer converted to a travel trailer with no battery. To me that means all bets are off as to whether or not pin 4 is even wired for a battery. Hence the statement to go plug in a flasher in and see what happens. :)