Thread: no crank, no power, key locks, shifter locks

Yes I have cleaned the cables, I have checked the ignition switch. It checks out fine after I have left the batt cables off for 12hrs. But as soon as it does this crazy thing it dosnt have power, but thats to be expected because almost everything else dosnt either. I still think it is a theft deterrent thing (although there isnt a security light flashing) or perhaps its a capacitor in the ECM going bad and so when the power is removed it drains the capacitor and erases the memory of the ECM. No one has ever had this happen before? I asked an AMT mechanic trained in pontiac and he dosnt have any good answers either. All the symptoms go back to the fact that everything is fine after the batter is disconnected for 8+ hrs. but once driving or parked the car engine will either die or if trying to start, it wont have power to anything for no reason at all. If anyone knows anyone who is a mad scientist at the electrical department of these cars please ask them for me or have them post a reply on here. Thanks again for the ideas and sugestions.