I have a 1999 Mercedes Benz E320 and with my headlights on, my engine will shut down when using signal to turn. Runs fine with headlights and I can use blinkers when headlights are off. Also using horn turns off engine. Any ideas?

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I have a 1999 Mercedes Benz E320 and with my headlights on, my engine will shut down as soon as I use the turn signal.. Runs fine with headlights and I can use blinkers when headlights are off. Also using horn turns off engine as soon as it is pressed. Any ideas what may be causing this? In other vehicles, I see some mention of bad wires in the column. The battery needs replacing but the alternator is good as well. Could a bad battery maybe cause this?

How long has your 1999 Mercedes-Benz E320 had this problem?

Just started when dash indicated I had a light out.