240/91 backup lamps do not work...

Discussion in 'Volvo 240' started by Bluefox, Jan 12, 2004.

  1. Bluefox

    Bluefox Guest

    have current on the switch at the top of the gearbox.
    Lamps are OK;
    what could be the cause of the problem?
     
    Bluefox, Jan 12, 2004
    #1
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  2. Bluefox

    James Sweet Guest

    Is the switch completing the circuit?
     
    James Sweet, Jan 12, 2004
    #2
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  3. Bluefox

    steve sedlis Guest

    1. check bulbs with test meter.
    2. check switch with meter.
    3. check wiring harness end to end.
    4. check fuses or relays.

    if all this fails....











    reconnect the battery!
     
    steve sedlis, Jan 13, 2004
    #3
  4. Bluefox

    volvowrench Guest

    240 reverse lights are powered through an edge connector at the left rear
    taillight assembly. The connector contacts copper strips fused to a mylar
    "wiring plate." Over time the compression forces of the connector cause
    the plastic under the mylar bit to creep and deform. Once that happens
    the edge connector cannot make adequate contact to complete the circuit
    to the bulbs. Often using a piece of brass shim stock to bridge the
    connection on the black wires in the edge connector will restore
    connectivity to the bulbs. (One black wire comes from the switch and the
    other goes to the bulb on the other side of the car after being bridged
    at the connector.)

    Bob
     
    volvowrench, Jan 15, 2004
    #4
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