Trouble connecting computer to engine

[yamajason]

"wont flash when engine is running." You are going to have to explain what that means...flashing LED or flash/upload file to truck computer. Probably best to go to an experienced mechanic shop from a guy on this forum and he has 2nd set of laptop & adapter to isolate the problem quickly and show you some new tricks!

I know we all would rather do it ourselves, but time is $