FBO box took a dump. I think

Well it wasn't the box after all.Yesterday I gutted an orange box, and installed a 4 pin hei in it. Turned out great. but no start.
removed the plug from top of the box and hooked it up via clip leads. Fired right up, did the same with fob box, fired right up.
Just have to get a new harness for the box as the coil neg wire was broken where is bends through the plug body. Must have been making just enough
contact when I tested the box before gutting it.