Halogen Headlights - Upper lights not working
Fleet Mechanic
Joined: Mar 2014
Posts: 1,272
Likes: 130
From: Missouri
Are the bulbs good? Did you inspect the wiring they installed when they set the plow up? They could have done some hokey work and blew a fuse. If they used those cheap crimp taps you should replace those right away.
Fleet Mechanic
Joined: Jul 2008
Posts: 1,937
Likes: 1,221
From: Southern Crescent
Being a southern boy (old geezer, actually) I know nothing about snow plows. But being somewhat electrical my first guess would be grounding. Especially if the install involved R and R of a lot of the front of the truck. A ground lug could easily have been taken loose and not replaced.
Mountain Pass
Joined: Jun 2020
Posts: 248
Likes: 40
From: Texas
Dumb question, as i too am a southern boy with no plow experience. Does your plow have a built in set of headlights on it? Curious if they stole the upper headlight plugs to run those lights and you would need to swap them back after taking the plow off.
Trailering
Joined: Nov 2019
Posts: 17
Likes: 4
Typical Plow Lighting Install on 4 Headlight system -- will only let 2 headlights operate mainly because plow lights are usually only 2. If you unplug plow lighting Normal Headlight Function should return. (If wired the way I normally find them). Check with Plow Manufacture Paper Work or Online for any Wiring Help.
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Laughing Gas
Joined: Dec 2019
Posts: 863
Likes: 35
From: MA
Typical Plow Lighting Install on 4 Headlight system -- will only let 2 headlights operate mainly because plow lights are usually only 2. If you unplug plow lighting Normal Headlight Function should return. (If wired the way I normally find them). Check with Plow Manufacture Paper Work or Online for any Wiring Help.
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2nd Gear
Joined: Nov 2022
Posts: 2
Likes: 0
Same issue
I installed the 16071200a adapter for Ford 250-550 2020+ w/halogens harness onto my 2016 truck-side wiring. All the part numbers were the same so I just pulled the wiring from my tundra that I traded in and installed it on the F350. I have halogen housings with GTR led bulbs. I am experiencing the same problem, I did find some corrosion on the truck wiring plugging into the headlight bulbs, cleaned that with no success. Started messing with the truck side plow wiring and I can get passenger side upper bulb to flicker but not stay on, driver side upper bulb is out. I've swapped everything to troubleshoot, all bulbs work. I think there is bad contact somewhere between 16071200a(new harness adapter) and the original truck side plow wiring. Does anyone happen to know which color wires control the upper bulbs? I will be investigating further.
2nd Gear
Joined: Nov 2022
Posts: 2
Likes: 0
Process of elimination
I installed the 16071200a adapter for Ford 250-550 2020+ w/halogens harness onto my 2016 truck-side wiring. All the part numbers were the same so I just pulled the wiring from my tundra that I traded in and installed it on the F350. I have halogen housings with GTR led bulbs. I am experiencing the same problem, I did find some corrosion on the truck wiring plugging into the headlight bulbs, cleaned that with no success. Started messing with the truck side plow wiring and I can get passenger side upper bulb to flicker but not stay on, driver side upper bulb is out. I've swapped everything to troubleshoot, all bulbs work. I think there is bad contact somewhere between 16071200a(new harness adapter) and the original truck side plow wiring. Does anyone happen to know which color wires control the upper bulbs? I will be investigating further.
I ordered a dozen relays to replace the 6 in the box and have 6 backups. Ill see if those do the trick on monday, if not then ill order the vox and that will be that.
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