I recently had a guy install LLY on my 2005 duramax and the oil pressure gauge quit working as well as the battery not charging warning coming on. The battery light on the dash was staying on as well. He doesn't seem to know what is wrong. Does anyone have any idea what the problem could be. Alternator was fine and no warning lights before he added the program and put a 2 way switch on. Batter is now flat. I need help.