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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Lighting issue

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Old Sep 21, 2010 | 09:07 AM
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rh428wf's Avatar
rh428wf
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Lighting issue

I have a 79 dentside with a 351m. I have noticed in the past couple days when I go to work in the morning all the lights are dim until the rpm's get higher. Its like a damn dimmer switch in all my lighting. I cant put my finger on what it is, I just think I am reading too much into it and its probable a quick fix. Any ideas, please help.
 
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Old Sep 21, 2010 | 09:52 AM
  #2  
bkaul's Avatar
bkaul
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Joined: Aug 2010
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From: Knoxville, TN
Sounds like your system voltage is probably low until you get the alternator up to speed. Might be a weak battery, or an alternator/voltage regulator issue. Run by an auto parts store and have 'em test it for you.
 
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