Headlights Flickering
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Tuned
Joined: Jan 2013
Posts: 286
Likes: 8
From: Chandler, AZ
I am intriged by the option to add a switch between the high-beam and headlight switches that allows both the low and high beams to be on together. Looks simple enough. Isn't this the way most modern cars operate? The brights alone are OK but sacrifice light out front for light in close. No specifics are available on that option other than the diagram at the bottom of the excellent write-up. Does anyone know if its just as simple as wiring a switch between the HB and HL switches? Would this need to be fused or is that already covered by the 20 AMP fuse between the relay and the battery?
Laughing Gas
Joined: Mar 2013
Posts: 770
Likes: 309
I am intriged by the option to add a switch between the high-beam and headlight switches that allows both the low and high beams to be on together. Looks simple enough. Isn't this the way most modern cars operate? The brights alone are OK but sacrifice light out front for light in close. No specifics are available on that option other than the diagram at the bottom of the excellent write-up. Does anyone know if its just as simple as wiring a switch between the HB and HL switches? Would this need to be fused or is that already covered by the 20 AMP fuse between the relay and the battery?
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 286
Likes: 8
From: Chandler, AZ
That makes perfect sense astronaut. Thanks for the advice. Was not actually relishing the prospect of chasing down wires under the dash to do this anyways 
Will leave well-enough alone.
Will leave well-enough alone.
Laughing Gas
Joined: Mar 2013
Posts: 770
Likes: 309
8th Gear
Joined: Sep 2022
Posts: 8
Likes: 1
Lights are pulsating on my 1966 F100
Hi All,
I am a new member having recently purchased a 1966 f100 flare side. I am experiencing a pulsating of the head lights and internal dashboard lights, not a flickering. I have had the alternator checked and the alternator and belts are in good order. In reviewing this thread, I see reference to an article and when I use the link, the link is not working. Can anyone provide a good link to the article? Any opinions on how I can resolve the issue?
Look forward to learning and sharing with this community,
Thank you much!
I am a new member having recently purchased a 1966 f100 flare side. I am experiencing a pulsating of the head lights and internal dashboard lights, not a flickering. I have had the alternator checked and the alternator and belts are in good order. In reviewing this thread, I see reference to an article and when I use the link, the link is not working. Can anyone provide a good link to the article? Any opinions on how I can resolve the issue?
Look forward to learning and sharing with this community,
Thank you much!
FTE Legend
Joined: Nov 2015
Posts: 30,860
Likes: 4,106
From: Angier, NC
They talk of "Flickering" but what I think the first post was talking about is the head lights going out all together and being in the dark other than parking / tail lights staying on.
I would call this head lights cutting off and it is the hard light switch breaker tripping and resetting.
Your "pulsating of the head lights and internal dashboard lights" could be called flickering in my book.
I hang out in the 80 to 86 truck area and a user had the same issue as you and IIRC it was a ground issue.
You need a ground from battery to motor, motor to frame and motor to body / fire wall.
This is how the factory did it on the 80 - 86 trucks and I dont have any pulsating or flickering of lights.
I think people miss the body ground and think the cab bolts take care of it but forget the cab is mounted on rubber mounts.
Also the lights did not flicker / pulsate when new so something (grounds?) has gone bad over time.
Dave ----
edit I also could not open the link but I think after reading this thread it had to do with adding a head light relay kit.
It is plug n play no cutting of wires. I got my kits from LMC but you can get them just about anywhere try Ebay or Amazon
I would call this head lights cutting off and it is the hard light switch breaker tripping and resetting.
Your "pulsating of the head lights and internal dashboard lights" could be called flickering in my book.
I hang out in the 80 to 86 truck area and a user had the same issue as you and IIRC it was a ground issue.
You need a ground from battery to motor, motor to frame and motor to body / fire wall.
This is how the factory did it on the 80 - 86 trucks and I dont have any pulsating or flickering of lights.
I think people miss the body ground and think the cab bolts take care of it but forget the cab is mounted on rubber mounts.
Also the lights did not flicker / pulsate when new so something (grounds?) has gone bad over time.
Dave ----
edit I also could not open the link but I think after reading this thread it had to do with adding a head light relay kit.
It is plug n play no cutting of wires. I got my kits from LMC but you can get them just about anywhere try Ebay or Amazon
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