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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Blinking Headlights

Old Nov 14, 2004 | 12:53 PM
  #1  
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ranger714
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From: metro atlanta
Blinking Headlights

my son drives a 1985 f150.a couple of days ago the headlights started flashing on and off like they were blinkers.anyone know whats going on?thanks for any suggestions.
 
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Old Nov 14, 2004 | 04:27 PM
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86f15035s
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From: Stanchfield,MN
check your grounds. this happened to me before on my 79 it turned out it was the ground.
 
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Old Nov 14, 2004 | 05:50 PM
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From: Dryden, ON, Canada
Grounds, or the circut breaker in your headlight switch has had the biscut.
 
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Old Nov 14, 2004 | 11:59 PM
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did the flashing happen while hitting bumps in the road if so this may not just be a ground i would also check the plugs into the bulb its self ive had many of those connections corrode and cause similar problems but the corrosion may be inside the plastic boot where you cant really check it out all that good some boots are a solid pece of plastic that cant be visualy inspected however i have also seen some with removable backs not really sure what they run i usualy have a few parts trucks sitting arround

i usualy check them out by un plugging the bulbs stripping back about 1/2 inch of wire coating from the hot wire and the ground and using a pece of heavy speaker wire with alligator clips on each end clip to the hot wire and ground wire then at the other end of the spaker wire connect it to the bulb in the same locations on the bulb tabs as they connect into the plug after that process is complete please remember to electrical tape the bare parts of the harness forgot once big mess
 
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Old Nov 15, 2004 | 01:22 AM
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From: Right Next to U
Loose ground connection to the lighting circuit, or possibly the dimmer (high/low beam)switch has a loose connection or is bad, replacing it will cure the flashing, or no lights situation.
 
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Old Nov 15, 2004 | 07:53 AM
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head light switch is likley the problem. Happened to my previous 82 and current 85 f150
 
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Old Nov 15, 2004 | 04:36 PM
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Happened on my '84. It was the ground strap that bolts from the back of the block to the firewall.
-Tom
 
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