My 1964 Eldorado convertible stalls while driving. It completely goes dead, it will not start up right away. when you turn the key there is no sound at all. After sitting for about 5 minutes, turn the key and the car starts right up. Already replace the fuel pump . It still happens. Does anyone have any idea on what may be going on?
I had a similar problem a few years ago. In my case it turned out to be the ignition switch. From what you describe it sounds like an electrical problem. Check ignition wiring. connections, components, battery cables, grounds, etc.
If you dont know the age of the battery cables, just replace them. At the ignition switch, check for blackened or darkened connectors. That indicates a loose and heated connector. Check the connector to the bottom of the fuse block also. Connection at the battery terminal on the starter needs to be check as well.
Be sure that the end of the negative battery cable ( which is located under the battery tray ) has a clean shinny connection were it connects to the cars frame
One of the more important ground connections
Are you at speed or at an idle when the car shuts off ?
I would consider having your local auto store check your charging system ( alt output ) and your batteries current condition
The second being more of a concern
Clean up your battery terminals and replace both battery cables to see the results first
Feels like an intermittent electrical connection as suggested by the other posts
Down right dangerous the problem you are having out on the road shutting down
Keep us posted on your results
What ever means you use I would determine the current condition of the battery first go from there to then trouble shoot electrical wiring connections as suggested by others