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Only one brake light out -not the bulb 900

"...bulb relay, and fuse are all OK - if faulty all three brake lights would be inoperative."

Bulb Failure Sensor could still be at fault. It will only kill all 3 brake lights if the single common input fails, But there are 3 separate outputs—one for each light. Lots of "new" parts come from less than reliable sources these days.

The output for the right brake light is the Yellow wire from terminal 11 (54R).

I'm sorry that this info probably isn't much help on a 900, with its inaccessible relay panel. It would be a breeze to check on a 240. Try another BFS if possible.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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