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Old 06-01-2018, 11:14 PM   #2
Stocker
20' Daredevil (Ret)
 
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Join Date: May 2003
Location: Jefferson State
Posts: 13,497
Re: 1968 C10 headlights flash with engine on or off

Welcome aboard!

Is it just a random on-off-on-off, with no regular pattern? Does it happen only when the light switch is on? Without more info, I'd guess a bad headlight switch. You might have to remove the switch to access it to test it with a test light or basic VOM. It might also be a loose-fitting connector on the headlight switch.
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1972 K20 LWB 350/350/205

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