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Volvo RWD 200 Forum

INDEX FOR 11/2008(CURRENT) INDEX FOR 7/2008 200 INDEX INDEX (NO RELOAD) [<<]  [>>]

VIEW    READ ONLY    PRINT   SAVE   A    A  Failure sensing the three Brake Light bulbs 200 1989 posted by  lucid on  Thu Jul 31 05:50 CST 2008 Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS]     [IGNORE ALL POSTS] last visit: Fri Nov 21 20:15 CST 2008 [RELATED] "While the top mount brake light does run through the sensor, I'm not sure if it is part of the bulb out sensing system." As you know, the basic BFS principle is that an equal current thru two opposing coils (having the same number of turns) will cancel each other, and thus have no effect on the reed switch inside the coils, which grounds the Warning light. The 3-Light Brake Light test circuit is similar, except that the Left bulb is tested by one coil (say a nominal 20 turns), which is opposed by two coils end-to-end, nominally 10 turns for the Right bulb and 10 turns for the High Stop bulb. As long as all three bulbs work, the 20t coil and 2 x 10t coils cancel out. However, a failure of any one of the three bulbs will upset the 20:20 "magnetic balance" and the reed switch will light the BF Warning light. Mark this post as an answer to my question<- Use this feature to mark quality replies to your post. Select, copy to buffer, and paste anywhere: <a href="http://www.brickboard.com/RWD/volvo/1292791/220/240/260/280/failure_sensing_three_brake_light_bulbs.html">Failure sensing the three Brake Light bulbs</a>

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• Tail light woes cured, temporarily... [200][1989]
  posted by  Justin A  on Wed Jul 30 14:21 CST 2008 > V

• Tail lights work but I get the bulb failure light [200][1989]
  posted by  pageda  on Tue Jul 29 14:58 CST 2008 > V
  • Tail lights work but I get the bulb failure light [200][1989]
    posted by  Justin A  on Tue Jul 29 16:23 CST 2008 > V
    • Tail lights work but I get the bulb failure light [200][1989]
      posted by  TONY H  on Wed Jul 30 12:10 CST 2008 > V
      • Tail lights work but I get the bulb failure light [200][1989]
        posted by  Justin A  on Wed Jul 30 12:24 CST 2008 > V
        • Tail lights work but I get the bulb failure light [200][1989]
          posted by  boxvolvo  on Thu Jul 31 05:35 CST 2008 > V
          • Failure sensing the three Brake Light bulbs [200][1989]
            posted by  lucid  on Thu Jul 31 05:50 CST 2008 > V
            • Failure sensing the three Brake Light bulbs [200][1989]
              posted by  boxvolvo  on Thu Jul 31 06:05 CST 2008 > V
        • Check out the common ground wire for the right side tail light (NMI) [200][1989]
          posted by  lucid  on Wed Jul 30 13:05 CST 2008 > V
        • Tail lights work but I get the bulb failure light [200][1989]
          posted by  TONY H  on Wed Jul 30 12:57 CST 2008 > V

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