Question about 1986 Mercedes-Benz 300

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My hubby is tearing his hair out trying to figure out why our Mercedese 307D Carleton Hilton Motorhome back lights are dim, tried looking for wiring diagram on net but no luck, bought workshop manual, dosn`t work on ANY pc we have PLEASE PLEASE can anyone help before he ends up bald.please send solutions to billyfantastic@ntlworld.com thank you

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Are the insides of the lenses clean?
Check that the earth wires are connected properly to the chassis and that the contact areas are clean and the terminals/screws tight. Try following the wiring back and see if there are any connectors that might be loose or dirty. If all the lights work correctly ie. brakes, tail lights and indicators, etc, it would not be a wiring fault. As a final check, test the voltage at the bulb terminal to ground an see if you get 12v+(?) with the lights on (if it is a 12 volt system) and make sure that the bulb voltage matches the vehicle voltage. (Not 24 volt bulbs on a 12 volt system).

Posted on Mar 27, 2011

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