Ok so I am driving my 1985 300D Turbo today and when I go to turn off my car it keeps running and the battery light comes and stays on. I try several times to turn it off and eventually it dies... as in sounds slower and slower until the engines dies. It starts up again fine I drive back to work and it turns off ok but with a little hesitation like it is going to just keep running again with key in off position. Has anyone experienced this sort of thing and knows what it could be ? Is it meaning that the battery is going bad, the alternator needs replacing, the ignition has a problem.

Any help would be appreciated.

Tony
1985 300D Turbo Diesel