Lights Flickering...
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Senior User
Joined: May 2012
Posts: 278
Likes: 0
From: Ball Ground Georgia
Lights Flickering...
Ok. Here is what I have. All lights flicker on and off (sometimes) until they just stay off. Especially when it rains. I replaced the high beam switch and it seemed to fix the problem but the lights started flickering again recently. I'm going to go through all of the grounds, but I wanted to check to see if anyone had any other suggestions for me to check out. Thanks in advance.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Headlight switch is prolly oveheating due to the headlight's current going through the switch. Consider installing a headlight relay system to reduce the load on the switch.
$30 from LMC or build your own: Whiter Whites, Brighter Brights - Ford Trucks
$30 from LMC or build your own: Whiter Whites, Brighter Brights - Ford Trucks
Fleet Mechanic
Joined: Jul 2004
Posts: 1,455
Likes: 4
From: Western Kentucky
You can check the grounds each headlight has its own ground. You have full power to the lights going through the headlight switch and the dimmer switch, this can cause them to overheat and arc out.
Fleet Mechanic
Joined: Jul 2004
Posts: 1,455
Likes: 4
From: Western Kentucky
Yes they did. I want forget the first time it happened to me. I had just bought a 67 when it happened and the truck wasn't but 2 year old in 1969.
The best thing to do is make sure the switches are good and install relays as HIO said
The best thing to do is make sure the switches are good and install relays as HIO said
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
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Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Oh yes sir indeed it was, I thought they all of that era did it. 
Big PLUS 2 on HIO and the Whiter Brighter Lights using relays by Steve Delanty. I did this years ago and mine haven't blinked since.
John
Big PLUS 2 on HIO and the Whiter Brighter Lights using relays by Steve Delanty. I did this years ago and mine haven't blinked since.
John
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Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
You guys are smokin' your socks. On brand new cars and trucks, all of them were defective. Nobody drove at night in those days?
Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
Heavy loads on a electrical connection that is not robust enough to tote the load .....
Issues shall arise . Ever have your headlamps go out at 3 am after a few suds and driving a bit fast on a country road ?
I have ....
Issues shall arise . Ever have your headlamps go out at 3 am after a few suds and driving a bit fast on a country road ?
I have ....
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Personally, I wouldn't say it was defective... not just well engineered.
Simple aging, heat cycles, and accumulation of dust/dirt on terminals results in marginal increases in resistance... resistance equals heat. Heat is what that lil bimetallic strip reacts to and the lights cycle on and off.