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Rear defroster 200 1980

uid 8162's pic
posted by  Kyle242GT on  Thu Jan 22 04:58 CST 2004
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Hi Board-

My rear defroster doesn't work. I have 12V+ to the elements in the glass, but nothing more.

Not enough current? Maybe I should check the amp draw through the thing... can anyone provide a spec? What about resistance across the elements, what should that be?

Many thanks-
--
Kyle
Santa Rosa, CA

1980 242GT 198K
1990 744Ti 115K
1972 Riviera 130K
1972 240Z 1K (since restoration)
1972 Datsun Pickup 87K(187K?)







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    Rear defroster 200 1980

    posted by  Volvodad on  Thu Jan 22 05:27 CST 2004
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    last visit: Thu Oct 23 16:18 CST 2014
    [RELATED]

    In addition to Miguel's excellent trouble-shooting procedure below, pull the switch out of the console and check for burned contacts at the wiring plug. This is probably not the cause if you do have a full 12V at the grid +ve side, but it's a quick check.
    --
    Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)








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    Troubleshooting 200 1980

    posted by  Miguels244 on  Thu Jan 22 05:18 CST 2004
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    last visit: Sun Sep 30 07:47 CST 2007
    [RELATED]

    Hi Kyle
    The voltage end to end of the elements should be 12v
    here is how to check the individual filiments
    the voltage from one end to the middle of each element
    should be 6v...if it is 12v the filiment is open between
    the end you're checking against and if it is 0v the filiment
    is open to the other end.
    ASCII art follows

    GOOD
    <-gnd>-/\/\/\/\/\/\/\/\/\/\/<+12v>
    |______6v____|

    Case1
    <-gnd>-/\/\ \/\/\/\/\/\/\/<+12v>
    |_____12v____|

    Case2
    <-gnd>-/\/\/\/\/\/\/\ \/\/<+12v>
    |______0v____|


    you can check the current by pulling the fuse and putting an
    ammeter in line...or pulling the connection to the grid and
    doing the same.

    If you have a bunch of broken traces the current will be low
    because the overall resistance of the circuit will be higher.

    broken traces can be fixed (in theory) with special paint...
    I have never done this though. Auto parts stores sell a kit.

    Miguel
    --
    My First Volvo - stock (for now) '84 244, 230+kmi. Owned it since 9/03







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