Headlight Switch Problems
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Mountain Pass
Joined: Nov 2008
Posts: 159
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Headlight Switch Problems
Hello. When i turn my parking lights on and the factory fog lights then the high beams are on and when trying to go to low beams nothing changes. Also the Back up alarm 'off' light is on and there is no back up alarm even though i didn't turn it off.
So my question is 'is there some sort of 'multi-functional' part that controls all of these or is it that they are independant and just all going bad at the same time?
BTW i did do a search but found no results for this problem.
Any help here would be appreciated.
So my question is 'is there some sort of 'multi-functional' part that controls all of these or is it that they are independant and just all going bad at the same time?
BTW i did do a search but found no results for this problem.
Any help here would be appreciated.
Hotshot
Joined: Mar 2011
Posts: 11,950
Likes: 5,076
A lot of wiring is dependent upon other wiring. i.e. The high beams won't come on unless the low beams are on OR the switch is pulled toward the driver into the "momentary" position.
My first thought is the light switch, but I don't believe that the high beam wiring goes through it. That makes the most likely culprit the turn-signal/high-beam switch. It changes easily (I changed one on my truck a short time back and have another ready to go into the Excursion).
But there could be other issues, too. A short, bad relay, etc. If you've got an older truck with similar switches, try swapping them before you throw money at parts!
My first thought is the light switch, but I don't believe that the high beam wiring goes through it. That makes the most likely culprit the turn-signal/high-beam switch. It changes easily (I changed one on my truck a short time back and have another ready to go into the Excursion).
But there could be other issues, too. A short, bad relay, etc. If you've got an older truck with similar switches, try swapping them before you throw money at parts!
Laughing Gas
Joined: Dec 2017
Posts: 879
Likes: 40
From: Greensburg, IN
Spray the sensor with wd40 and it might wake up again. It might not, but a shot of wd40 is less work than a replacement sensor
Laughing Gas
Joined: Dec 2017
Posts: 879
Likes: 40
From: Greensburg, IN
https://www.blueovaltrucks.com/tech-...ensing-system/
this has a really detailed diagnosis and replacement instructions.. I know it's a "competing forum" but still.
this has a really detailed diagnosis and replacement instructions.. I know it's a "competing forum" but still.
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