Question about 1988 Volvo 740

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Looking for socket turn ligth

I am looking for a socket from a back turn ligth, from Volvo 740--1988

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Those are Bosch sockets which Mercedes and Volvo loved, but which are a royal pain. The socket is a dual-filament socket  probably combining the tail light AND turn signal. The others are all single-filament sockets. They are NOT interchangeable. First determine whether the socket is really at fault. Sometimes the contact points don't quite connect with the long busses in the tail light assembly. I have successfully cleaned mine. Maybe you can reform the contacts to make better contact. If not,  Ebay has what you want under Volvo parts. The sockets for the 240 and 740 are the same, an d will fit either sedans or wagons. Voluparts in Atlanta Georgia has them too. Any junk yard with Volvos will have these sockets.  I bought a bunch of spares for $10

Posted on Dec 14, 2008

  • Arthur Aldrich
    Arthur Aldrich Dec 15, 2008

    If there is no socket whatsoever, you need to get one. But if there is a socket that doesn't work, try a simple test. With a continuity meter and a bulb in the socket, check for a reading between either of the bulb contacts and ground. The tail light uses a two-filament bulb, one for the tail light and one for the stop light. If you get a reading, the socket and bulb are good, just not mounted correctly.
    Does the bulb warning light on the dashboard come on? Are both tail lights out or just one? If the the bulb warning light does not come on, and both tail lights are out, you may need a bulb sensor relay - the big round one on the left side of the relay block behind the ash tray. Also $10 used on Ebay.
    Does the center stop light come on when you press the brakes and the other brake light?
    Remember, you can interchange a dual filament socket with any of the others - directional, back-up or fog lamp, but you cannot exchange any of these for the dual-filament socket.
    My 240 used a separate fuse for the left and right stop lights, Just for peace of mind, check the tail light fuse.
    If you need emergency tail lights for driving at night, turn on the Fog Lamp switch on the dashboard. An extra set of tail lights will come on when the headlights are in use. I have used this trick to get home when both tail lights went out on me.

  • Arthur Aldrich
    Arthur Aldrich Dec 15, 2008

    Misread your question. Turn signals (the yellow colored lenses) use a single filament lamp and socket. A double-filament socket with a single filament bulb should work.
    Does the lamp out signal come on when the directional missing a socket is used?



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