Dash lights flashing

[Dcolumbia]

Ok, so yesterday I did the injector leak down test. While I was reinstalling the front metering valve, I dropped one of the t 30 bolts. While doing an extensive search of the frame and block I came across the ground cable that comes off of the rear of the starter and bolts to the block. That cable had rotted thru at the block end. I put a new end on it and plugged the compass module back in thinking that it could be the source of the flashing light problem I was having. That turned out to be the problem. Truck seems a bit more responsive now too. Just thought it might help somebody else out.