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 ??
No Headlights
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Michael 247, Jan 23, 2020.
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Rideandrepair Thanks this.
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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?
SAR, Rideandrepair and AModelCat Thank this. -
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..
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Headlights out again..Swaped 2 different relays but still no Headlights
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Have you checked for 12v at the headlight. Does it have fuses or breakers?
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Check for connectors that go from hood to frame. Those go to crap on every truck after a while
blairandgretchen and BoxCarKidd Thank this. -
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.
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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..
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Sounds like bad ground to headlights. Which wire is hot should change on bright and dim. The other is ground.
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