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Why would only the third high level brake light to work but not the taillight level brake lights on a 1996 Ford Contour?


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2011-09-13 17:21:17
2011-09-13 17:21:17

The CHMSL (center high mounted stop light) is activated by a circuit independent of the outboard stop/turn lamps. Outboard stop lamps become left or right turn signals when interupted by the turn signal switch/flasher circuit. The CHMSL must remain independent to escape the interuption of the turn flasher. The circuit that powers the outboard stop/turn lamps and the CHSML share the same fuse on GM, Ford and others are probably the same. The 12v feed passes through the brake light switch before it splits to independent feeds: one straight to the CHMSL, the other to the turn switch/flasher which splits it into a separate feed for either the left or right lamps. My best guess is your OK at least to the brake switch. The problem lies beyond and my experience would lead my initial search for a faulty ground in the rear lamp harness. Good luck, it's a cold day for working on a car.

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