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1981 Chevy Silverado head lights blink on and off

Tiny
BULLWHIP1
  • MEMBER
  • 1981 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 101,589 MILES
Hello
i have a 4 headlight system 1981 chevy 1/2 ton 4x4, the head lights will start blinking after being on for about 1/2 hr, it only does this when they are on bright, and then both dim and brite blink, if I leave them on dim, they will stay on, with no blinking,
it does not matter if the truck is moving or setting still, they still blink
i have replaced the headlight switch and the dimmer switch 3 times, thinking I might have gotten faulty ones, this is about to drive me crazy !
also replaced all bulbs and sockets, and none of the other lights are affected ! Like, dash, brake, turn signal. They dont blink
i am think of getting a heay duty headlight harness from LMC, that draws power from the battery, instead of the headlight switch. !
can you help with this problem?
thanks
charles
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Tuesday, October 20th, 2009 AT 3:25 PM

3 Replies

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Does it do this when the engine is running? Do the lights go completely out? Did you check the ground connection?
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Tuesday, October 20th, 2009 AT 8:55 PM
Tiny
BULLWHIP1
  • MEMBER
  • 1 POST
Yes it does it when the engine is running, and it does it with the engine off, and yes we check and cleaned all the grounds
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Tuesday, October 20th, 2009 AT 9:52 PM
Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
Do a voltage test drop test on the circuit. It sounds like you have a corroded wire somewhere. Test the voltage drop on both the negitive and positive side of the circuit.
A wire may appear to be good, it may even have continuity, but below the insulation - it can be corroded or broken. Causing a voltage delivery or drain issue.
Check the harness connector (the electrical plug). Make sure the internal connecting tabs are making good contact.
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Tuesday, October 20th, 2009 AT 10:14 PM

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