I was getting really erratic reading when i had my issue. I thought I fixed it only to find out a day later mine was overcharging again. I guess where the blue wire was grounding out it must have become ungrounded for a short period of time then regrounded itself. It drove me crazy. Best thing is to look at the wires at the base of the column and trace some of the wires back to see if you see any signs of melted wire. Also any wires in the engine compartment. It becomes pretty obvious once they start to melt.