ThomasBorchers Posted October 27, 2014 Share Posted October 27, 2014 Hello,with my 72 Marquis Brougham, I have the problem that the stop lights will not work. I checked the switch at the brake pedal, when I press down the pedal a bit, there flows current through the switch as it shall. I am a bit confused why I find a second hydraulic stop light switch at the master cylinder. Actually I know it so, if I press down the brake pedal, the stop light switch close the connection so that current flows through and the switch to the stop lights. But here, there flows always current. So actually the stop lights should always work...I must say, that I don't understand this system with the two switches. Help....But I have a guess... is the switch at the brake pedal not for the stop lights? Could It be, that this one blocks the gear lever not to go into a drive position, if the pedal is not pressed down?Kind regardsThomas Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 27, 2014 Share Posted October 27, 2014 Maybe a silly question, but how is the ground for the stop lights at the back of the car? Might look if it is in the trunk and see if it was knocked off or damaged by cargo. If outside, is it rusty or corroded? Link to comment Share on other sites More sharing options...
dictator27 Posted October 27, 2014 Share Posted October 27, 2014 The switch on the brake pedal is the correct one. Remove the wires on the switch on the master cylinder, connect them together and check for the tail lights coming on when the brake pedal is pressed.Terry Link to comment Share on other sites More sharing options...
JACK M Posted October 27, 2014 Share Posted October 27, 2014 Power for the brake lights have to run thru the turn signal switch first. Link to comment Share on other sites More sharing options...
ThomasBorchers Posted October 28, 2014 Author Share Posted October 28, 2014 @ Larry : Everything looks really good and the stop lights and turn signal have the same bulb.@ Terry : I checked it as you said but will not work. @ Jack : This is a good hint. I remember my 1956 Buick I had in the 90s. There I had also problems, if the turn signal lever was not absolutely in the middle : No brake lights. Has someone a wiring diagram where I can see the colors of the cables?RegardsTom Link to comment Share on other sites More sharing options...
keiser31 Posted October 28, 2014 Share Posted October 28, 2014 Google "1972 Mercury Marquis wiring diagram" and see diagrams in black and white, but the colors are marked. Link to comment Share on other sites More sharing options...
ThomasBorchers Posted October 28, 2014 Author Share Posted October 28, 2014 I searched a lot the last days, but found now one diagram via Google. I followed just the circuit from the switch through the connectors. There was always power. Last check was the connector in the trunk. Also power. I connected the cables again and... have now brake lights. :confused: But I really don't know whey--- RegardsThomas Link to comment Share on other sites More sharing options...
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