Busted rear window - 3rd brake light not working (97 850 T-5)

Discussion in 'Volvo 850' started by Joe S, Jun 6, 2005.

  1. Joe S

    Joe S Guest

    Vandals blew out my rear window with a big rock. Coincidentally, the
    3rd brake light (the one in the rear window) stopped working, but there
    was no contact with the housing, there is no damage to it and the bulb
    filament is intact. I have not yet had time to confirm by metering that
    there is no current, but since all else seems fine, I assume there is
    no current.

    Is it, by any chance, such that if the defroster ciruitry is damaged,
    the brakelight fails, as well?


    Joe
     
    Joe S, Jun 6, 2005
    #1
  2. Joe S

    Mike F Guest

    On the 850 sedans, the 3rd brake light assembly slides onto contacts
    that power it. These contacts are not high enough quality for the job
    they have to do. Try moving the light forward a bit and see if it
    starts working.

    --
    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
     
    Mike F, Jun 7, 2005
    #2
  3. This one near drove me nuts. Replacing the bulb fixed it for a day or so.
    Wiggling it fixed it for a day or so. Shining up the contacts fixed it for
    a day or so. Bending the tangs fixed it for a day or so. Applying a little
    conductive grease fixed it for a day or so. In retrospect, these are all
    probably just variants of wiggling it.

    Eventually I figured out that the wires connect to the lower slide contacts
    with spade lugs and that the upper (removable) piece connects to its bendy
    contacts with spade lugs. It turns out that the wires to the lower assembly
    are just long enough that you can just pull them out a couple of inches and
    connect them to directly to the spade terminals on the socket. Voila.

    It might be a little tricky sliding the assembly together with the
    relatively short wires attached if you haven't already done it 75 times
    trying to get the sliding contacts to work, so maybe you should spend a
    couple of months trying to fix the bendy-slidy contacts before re-routing
    the wires as I've described.
     
    Robert Lutwak, Jun 8, 2005
    #3
  4. Joe S

    Joe S Guest


    LOL! Thanks for the advice!


    Joe
     
    Joe S, Jun 8, 2005
    #4
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