Question about 1998 Mercury Mystique

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1998 Mystique brake lights don't work while the window brake light does work.

Anyone know where I can get an electrical schematic for a '98 Mercury Mystique brake system? The window brake light works while the tail brake lights don't. Brake fuse is good and the turn signals work.

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Try a continuity test, not sure where to find the electrical scheme but if you obtain it, use a tester or borrow one to test the continuity of the wires of both taillights, could be simple as a cut wire.

Posted on May 24, 2009

  • sassynwenchy Jul 18, 2011

    There is a short in the wiring harness that connects the brake light switch and the cruze control switch. You will need to replace that wiring harness. I found out that that part is no longer made. You will have to go to a junk yard to get this part. The brake light switch/cruze control is on the brake pedal.

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Posted on Jan 02, 2017

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1 Answer

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I had the same problem with my 1996 Mystique about a year ago. The brake and tail lights stopped working, except for the center brake light in the window. Turned out to be oxidation of the terminals at the connector on the turn signal. Yes, that's right, turn signal. The electrical signal to the tail lights goes thru the connector on the turn signal. To fix, I cleaned the contacts and the brake lights started working again. Hope this helps. Cheers, Henry

Nov 25, 2008 | 1998 Mercury Mystique

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