> When I start the car cold, I can drive it indefinitely, and the voltage > will stay around 13. If I turn off the ignition for any length of time, > and turn it on while the car is still hot, The voltage drops to nothing, > and the battery light comes on. Joe, Take a look at the connection of the battery ground cable (black) to the frame. If it is corroded, then there is your problem. bye, Ralf. VIN10284