Headlight issue
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Joined: Aug 2011
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Headlight issue
We are having a issue in our 91 f350 with the headlights. They are going on and off kinda like a strobe light. The first time it did it my husband had been driving it up a really rough road. He had been driving with lights on for about a hour. Since then its been doing it on smooth roads as well. We could be driving with the lights on for a few hours before they start "strobe lighting" . We can fix most things bt electrical and wiring is something we just dont understand. So what would be causing this issue?
Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
It's the headlight switch,, the thermal breaker is opening and closing because the contacts are worn and heating up...
Also check the headlight switch plug for any burnt places or signs of overheating/ melting of the plug material..
Also check the headlight switch plug for any burnt places or signs of overheating/ melting of the plug material..
Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
Here is another thread with the same issues....
https://www.ford-trucks.com/forums/1...ght-issue.html
https://www.ford-trucks.com/forums/1...ght-issue.html
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Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
All of the other lights are on fuses, the headlight switch has a THERMAL BREAKER.. It gets hot and opens the circuit then cools then resets itself, Perfectly normal...
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Postmaster
Joined: Aug 2005
Posts: 4,728
Likes: 8
From: Cleveland, TN
You don't!!! It's inside the headlight switch... The cure is to replace the headlight switch, it is not the thermal breakers causing the problem, it is saving your truck possibly burning from an OVERHEATING contacts in the switch.
FTE Chapter Leader
Joined: May 2009
Posts: 8,843
Likes: 27
From: Eastern Ky
Its a simple deal, pull the headlight switch ****, then the instrument bezel.....2 screws, and a pigtail swapped later...It's done...
