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No Headlights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Michael 247, Jan 23, 2020.

Page 1 of 2
  1. Jan 23, 2020 #1
    Michael 247

    Michael 247 Heavy Load Member

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    Dublin Va
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    1990 Volvo / White / GMC..Both Headlights blinked off a few times over a 2 day period..This mourning both not working at all..anybody know where the relay is ??
     
    Michael 247, Jan 23, 2020
    Michael 247, Jan 23, 2020
    #1
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  3. Jan 23, 2020 #2
    Powder Joints

    Powder Joints Subjective Prognosticator

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    Sep 25, 2007
    Rosamond, SoCal
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    Should be near or in the fuse box I think.
     
    Powder Joints, Jan 23, 2020
    Powder Joints, Jan 23, 2020
    #2
    Rideandrepair Thanks this.
  4. Jan 23, 2020 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    By 90 were they not in the flip down panel under the center of the dash? Before that they were behind the panel on the left side of the clutch pedal?
     
    BoxCarKidd, Jan 23, 2020
    BoxCarKidd, Jan 23, 2020
    #3
    SAR, Rideandrepair and AModelCat Thank this.
  5. Jan 24, 2020 #4
    Michael 247

    Michael 247 Heavy Load Member

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    Dublin Va
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    Found it by the clutch...Had Dirt built up behind the Relay..Horn Relay is beside it so I changed them and got Headlights Working..
     
    Michael 247, Jan 24, 2020
    Michael 247, Jan 24, 2020
    #4
  7. Jan 24, 2020 #5
    Michael 247

    Michael 247 Heavy Load Member

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    Nov 20, 2017
    Dublin Va
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    Headlights out again..Swaped 2 different relays but still no Headlights
     
    Michael 247, Jan 24, 2020
    Michael 247, Jan 24, 2020
    #5
  8. Jan 24, 2020 #6
    062

    062 Road Train Member

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    Have you checked for 12v at the headlight. Does it have fuses or breakers?
     
    062, Jan 24, 2020
    062, Jan 24, 2020
    #6
  9. Jan 24, 2020 #7
    Mike250rs

    Mike250rs Heavy Load Member

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    Sep 24, 2019
    Raleigh, NC
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    Check for connectors that go from hood to frame. Those go to crap on every truck after a while
     
    Mike250rs, Jan 24, 2020
    Mike250rs, Jan 24, 2020
    #7
    blairandgretchen and BoxCarKidd Thank this.
  10. Jan 24, 2020 #8
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Is that is a push in breaker look closely and the connection terminals. They sometimes overheat and cause a bad connection. If the breaker was shorting out it may have damaged the breaker. Replace it and check its connections.
     
    BoxCarKidd, Jan 24, 2020
    BoxCarKidd, Jan 24, 2020
    #8
  11. Jan 24, 2020 #9
    Michael 247

    Michael 247 Heavy Load Member

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    Nov 20, 2017
    Dublin Va
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    I swapped the Breakers..The connection plug near Headlight has power to all 3 wires..when I unplug connectors on both sides they have power to middle wire only..
     
    Michael 247, Jan 24, 2020
    Michael 247, Jan 24, 2020
    #9
  12. Jan 24, 2020 #10
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    Sounds like bad ground to headlights. Which wire is hot should change on bright and dim. The other is ground.
     
    BoxCarKidd, Jan 24, 2020
    BoxCarKidd, Jan 24, 2020
    #10
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