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

Flickering lights?

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Old Nov 25, 2008 | 11:58 AM
  #1  
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Flickering lights?

When I first start up my F250, all the lights will flicker as the truck runs. After driving for a few minutes it seems to get better. I cleaned the battery terminals, the starter and ground wires all look ok, and the ground wire seems to be attached securely to the block. What else should I look at?
 
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Old Nov 25, 2008 | 02:31 PM
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Make sure you have a good ground to the body ,frame, and front grill area also. Possible bad light switch.
 
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Old Nov 25, 2008 | 05:49 PM
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Do they kinda surge bright and dim or turn on and off at a random pace?A bad alternator will make them surge in a steady rythym
 
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Old Nov 25, 2008 | 07:05 PM
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Run a ground wire from the voltage regulator mounting screw to a good ground. That usually takes care of it.
 
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Old Nov 26, 2008 | 09:23 AM
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There SHOULD be a pigtail that's 10 or 12 gauge wire (been a while since I looked at one) on the ground wire. It needs to get bolted to the core support close to the voltage regulator. Without a proper ground it (the regulator) won't work.
 
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