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Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

posted by  wesleytyler on  Sat Oct 13 02:04 CST 2012
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last visit: Sat Aug 23 19:10 CST 2014
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so i was having problems with the fuel pump, i think i have that resolved, besides fuel gage reads empty all the time now..........when i turn on the head lights the wipers come on the front and rear wipers. Any idea whats screwy?

Thanks!!!! without this forum over the years i just dont know what id have done!
wes
--
1990 740GL 186000mi 'The Bag Lady' 1991 240 235000mi 'KGB car' 1992 740 wagon 250000mi Visit My Volvo-Page http://volvo.wesleytyler.com/








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    Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

    posted by  wesleytyler on  Sat Oct 13 23:51 CST 2012
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    Ok thanks i am on the right trail now! Here is where i am at, if i turn on lights wipers come on, driver side headlight much dimmer, so if i disconnect the drivers headlight the problem goes away. i am looking in my books and online for exact location of this fender ground, in hopes this fixes it?

    side note : on inspection of drivers side light i found two things, one a vacuum hose not connected, and a two wire plug adapter not hooked up?

    From Volvo

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    1990 740GL 186000mi 'The Bag Lady' 1991 240 235000mi 'KGB car' 1992 740 wagon 250000mi Visit My Volvo-Page http://volvo.wesleytyler.com/








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      *Problem Solved* Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

      posted by  wesleytyler on  Thu Oct 18 22:03 CST 2012
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      OK thanks everyone, it was indeed the ground block on front driver fender well, fixed that problem.

      Thanks Everyone! how do i mark this as a done thread?

      now on to the 240....
      Wes
      --
      1990 740GL 186000mi 'The Bag Lady' 1991 240 235000mi 'KGB car' 1992 740 wagon 250000mi Visit My Volvo-Page http://volvo.wesleytyler.com/








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      Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

      posted by  aleekat on  Sun Oct 14 07:03 CST 2012
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      Based on its location, the vacuum line looks like the vent for the washer reservoir.
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        Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

        posted by  someone claiming to be bob on  Sun Oct 14 10:30 CST 2012 [RELATED]

        If you look at the inner fender behind the headlamp you will see a metal tab with multiple male tabs for ground wires attached to the inner fender with a screw. This is the ground buss. Remove it and clean the attaching point to the fender. The extra conector should be a washer pump mconector for the rear on a wagon. They only use 1 harness, so the conector is there but not used on a sedan. The vacuum hose is a washer vent. it should be conected to a tee with a 1 way valve in it.








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      Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

      posted by  Onkel Udo II on  Sun Oct 14 04:14 CST 2012
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      I can'r see either well but the connector is surely for an option not fitted to your can but common to the market...fog lights?

      The hose is more of a mystery but I have not worked on a 7-series in a while. Where does it start? Could it have been something like the vent/drain for an old-school battery.








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    Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

    posted by  someone claiming to be bob on  Sat Oct 13 14:58 CST 2012 [RELATED]

    Headlights and washer poump share a ground at the fender. Backfeeding through the wiper relay.








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    Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

    posted by  boxvolvo on  Sat Oct 13 06:45 CST 2012
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    last visit: Fri Oct 24 04:28 CST 2014
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    Chek out this thread

    http://www.brickboard.com/RWD/index.htm?id=1367597&show_all=1

    By any chance are your highbeams not functioning?







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    Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

    posted by  Steve on  Sat Oct 13 05:56 CST 2012
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    As Onkel points out, the first place to start is the ground planes to check for corrosion. See the FAQ page on locating and deoxidizing these before you start pulling circuits and components apart.
    http://www.brickboard.com/FAQ/700-900/ElectricalCircuitsRelays.htm#MaintainingChassisGrounds
    --
    See the 700/900 "FAQ" at the menu bar top screen left side.








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    Odd electrical issues, wipers come on when i turn lights on 1992 740 gas wagon 700 1992

    posted by  Onkel Udo II on  Sat Oct 13 04:14 CST 2012
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    Pretty sure you have a bad ground...no idea which one.

    If I remember Art's tutorials on how this works, the wiper motor is pretty much hot all the time and the grounding is what activates it and allows it to park.

    It will be interesting to see if my guess is correct because it really is an educated guess.






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