Back to the Electrical Drawing board (89 245 Flasher Unit)

Discussion in 'Volvo 240' started by Danny, Jun 8, 2004.

  1. Danny

    Danny Guest

    My flasher unit supplies me with entertaining 'Ghost' clicks. The
    flasher unit works perfectly when either the blinkers or hazards are
    engaged but during rest it intermittently clicks all by itself. This
    morning I pulled the rear headliner and disconnected the two wiring
    harnesses leading into the tailgate, sure that this would cure the
    problem but no luck. I have replaced the flasher unit and hazard
    switch, cleaned all fuses and a lot of grounds. Can anyone point me in
    another direction since apparently the tailgate harnesses are not to
    blame either.

    Thanks, Danny.
     
    Danny, Jun 8, 2004
    #1
  2. Hello again Danny,

    Apopolgies all for top posting it seems appropriate this time.

    You are having fun aren't you, I'd bet your very fed up with seeing behind
    that centre console now!!
    The amount of testing you've done so far is directing the process of
    elimination to the unsavoury area of the seatbelt warning system unless
    anyone else knows better, I think there is only one easy definitive way of
    testing for this causing your problem, but, it does involve interfering with
    some more wiring, it's as follows:- from terminal 49a on the flasher there
    should be three yellow wires, two of them go to the front seats, the other
    goes the indicator stalk switch, then back to the hazard switch, if you are
    confident enough, pry at the small catch which releases the yellow bunch of
    wires from the relay plug, and remove the yellow wires from the plug,
    reconnect the relay to the plug; you need to then separate all three yellow
    wires from the previously freed spade connector, strip a small amount of
    insulation from the end of each; turn on your hazard light switch, at this
    point nothing should be flashing, touch each of the yellow wires in turn
    back to terminal 49a (through the hole in the plug), one of them will cause
    the flashers to start working, this is the important one to reconnect back
    properly (you should be able to figure a way) to 49a; one of the other
    yellow wires should cause the seat warning lamp to flash (assuming LHD with
    no one currently in the passenger seat), put a label on this wire to the
    effect that it's for the drivers seat, the other yellow wire, if there is a
    passenger seated (seatbelt unclipped), should also cause the seatbelt
    warning lamp to operate, also label this wire for future reference.
    Leaving the two seatbelt wires disconnected, but insulated, re-assemble
    things to your satisfaction, try a short drive somewhere (after checking
    your flashers still work ok!), if your flasher relay is now behaving itself,
    then celebrate, if it isn't, then the only other thing I can think might be
    causing this problem would be an unstable or 'dirty' supply voltage from
    your alternator, though this is extremely unlikely, it's fixable by changing
    the voltage regulator, other than this I'm now officially stumped, unless
    there is some third party electronics, such as an alarm somewhere attached
    to the indicator wires, but it would have to be very faulty to cause this.

    TTFN, Ken
     
    Ken Phillips \(UK\), Jun 8, 2004
    #2
  3. Danny

    Danny Guest

    Thanks for your help Ken

    And yes, I am having fun, I love a puzzle. I went out to do as you
    instructed and found only a single yellow wire coming off terminal
    49a. I hunted around for some homeless, cut yellow wires from a
    possible previous attempt at this repair but to no avail. In looking
    through the wiring diagram I came up with two other plans. The easy
    one seems to be taking out the seatbelt warning bulbs which woul cut
    out most of those circuits (with the exception of the wire running
    from terminal 49a to the bulbs themselves. the more difficult but
    slightly better option seems to be disconnecting terminal 49a and
    running a jumper from it straight to the direction indicator switch.

    What do you think?

    Danny
     
    Danny, Jun 8, 2004
    #3
  4. Danny

    G Klein Guest

    Check the ground in the steering column

    --
    "*-344-*Never Forgotten"
    Is for the New York City Firemen who lost their lives on September 11,2001.
    The official count is 343, but there was also a volunteer who lost his life
    aiding in the initial rescue efforts. And I will never forget them as long
    as I live,
    nor should any American.
    "Mow Green"
     
    G Klein, Jun 8, 2004
    #4
  5. Danny

    Danny Guest

    Thanks, the ground on the steering column looks good!

    Danny
     
    Danny, Jun 9, 2004
    #5
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