Notices
1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
Sponsored by:
Sponsored by: Moser

'75 Night Lights!

Thread Tools
 
Search this Thread
 
Old Sep 12, 2005 | 03:02 PM
  #1  
mswift's Avatar
mswift
Thread Starter
|
Senior User
Joined: Sep 2004
Posts: 457
Likes: 0
'75 Night Lights!

When driving down the road in my '75 hi-boy with my bright lights on, sometimes the lights go completely out and I can't see where I'm going.

It never happens on the low beams, but only high beam. And once I switch it back over to low beams, they start working again. It doesn't happen all the time, but too damn often. One of these days it's gonna happen going around a corner, and I don't wanna rinkle a fender. Any suggestions on what the cause is. Pulling too much juice?

In the meantime, I'm running the Aircraft runway lights for my brights.

Mike
 
Reply
Old Sep 12, 2005 | 03:15 PM
  #2  
leadmic's Avatar
leadmic
Fleet Mechanic
20 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2002
Posts: 1,483
Likes: 273
From: Tulare U.S.A.
Sounds like a bad dimmer switch to me.
Leadmic
 
Reply
Old Sep 12, 2005 | 03:27 PM
  #3  
mswift's Avatar
mswift
Thread Starter
|
Senior User
Joined: Sep 2004
Posts: 457
Likes: 0
Never thought of that. I've got a couple extra trucks around, so maybe I'll swap it out for a UOS (Used, Old, Stock)

Mike
 
Reply
Old Sep 12, 2005 | 05:05 PM
  #4  
fellro86's Avatar
fellro86
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
either a dimmer or a short somewhere throwing the braeaker, but if all you you do is switch back to lows and it works, it would have to be the dimmer.
 
Reply
Old Sep 12, 2005 | 05:45 PM
  #5  
perky's Avatar
perky
Senior User
Joined: Dec 2002
Posts: 339
Likes: 0
From: Washington ,Mo.
Mine did that last year it was a dimmer switch.
Dale
 
Reply
Old Sep 12, 2005 | 06:28 PM
  #6  
alchymist's Avatar
alchymist
"Mifflin Clay"
Joined: Jul 2005
Posts: 3,177
Likes: 4
From: Mifflin, PA
Club FTE Silver Member

Did you by any chance replace the original bulbs with halogens?
 
Reply
Old Sep 12, 2005 | 06:52 PM
  #7  
BigShelby's Avatar
BigShelby
Senior User
Joined: Jan 2003
Posts: 312
Likes: 1
From: Huntsville, AL
The dimmer switch might not be bad though. I had a 73 Dodge D100 that did the same think and what I found was the dirt, moisture and rust had made for a bad ground. After I cleaned it I had no problems. Dimmer switches aren't expensive but this might be the trick.
 
Reply
Old Sep 12, 2005 | 11:08 PM
  #8  
hotroddually's Avatar
hotroddually
Laughing Gas
Joined: Mar 2004
Posts: 1,243
Likes: 0
From: Maple Ridge B.C. Canada
i have had the same problem and it was the headlight switch on the dash.the problem is your lights on high beam cause the wiring to heat up and it tripps a sealed breaker in the headlight switch,the problem will eventually happen on low beam as well.i changed the switch and the problem was solved.its all do to resistance in the wiring,so make sure all the contacts at the dimmer switch, and the headlight switch are all corrosion free.this will help ,and if you replace you headlight switch,up grade to a heavyduty model.hope this helps you out. -billy
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Sep 12, 2005 | 11:37 PM
  #9  
rebel_ford4x4's Avatar
rebel_ford4x4
Posting Guru
Joined: Feb 2003
Posts: 1,135
Likes: 0
From: Illinois
just dont drive with you high beams on, i never do anyway and i dont see much of a difference they make. its just a pain to have to turn off the highbeams every time a car comes in sight.
 
Reply
Old Sep 13, 2005 | 03:16 AM
  #10  
Torque1st's Avatar
Torque1st
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Flickering on and off can also be caused by a weak breaker in the headlight switch but I agree in this case it is probably the dimmer switch on the floor.
 
Reply
Old Sep 13, 2005 | 09:31 AM
  #11  
mswift's Avatar
mswift
Thread Starter
|
Senior User
Joined: Sep 2004
Posts: 457
Likes: 0
Thank you all for the recommendations/advice. I will swap out switch on floor first, and make sure the UOS is grounded good. If it continues, I'll throw in a light switch, and make sure sure all terminals are corrosion free on them as well. I'm pretty sure I've got a UOS for it too!

Thanks again!
Mike
 
Reply
Old Sep 21, 2005 | 12:56 AM
  #12  
mike 77jadegreen's Avatar
mike 77jadegreen
New User
Joined: Sep 2005
Posts: 5
Likes: 0
dimmer switch spray with wd 40 work it lots (dim/bright ) fixed a couple over the years like that
 
Reply




All times are GMT -5. The time now is 09:24 AM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE