1992 Mercedes Benz 300e brake light short

1992 MERCEDES BENZ 300E
190,000 MILES • 3.0L • 6 CYL • RWD • AUTOMATIC
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MANTONE
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When my headlights are off, everything works fine. With headlights on, when I hit the brakes, my taillights go out and the brake lights don't light up. I'm really hoping there could be a simple solution because I can't afford a wiring diagnostic. Any thoughts?
Mar 13, 2014 at 5:41 PM
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CARADIODOC
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This is typical of a bad ground on the rear lights. Look first for a broken or corroded wire. If the car has a trailer wiring harness, check if someone used "Scotch Lok" connectors to make the splices. Those don't keep moisture out, and that will result in a corroded connection.
Mar 19, 2014 at 2:55 PM