Headlight low beams
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Fleet Mechanic
Joined: Nov 2022
Posts: 1,697
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Headlight low beams
So, I don't have low beams on my 84 f250 6.9, is there some fuse or ground that might go out? I already replaced the dimmer switch, but that's not the source of it. (High beams work just fine)
i ain't rite
Joined: Mar 2005
Posts: 65,467
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From: Marlboro Mental Hospital.
check the bulbs, the low circuit may be bad.
and the plug going into the dimmer switch may be bad. being on the floor the plug and wires will collect a lot of dirt and water causing corrosion in the terminals, and wires. i lost the headlights on my 88. when i took the switch out the plug and wires fell apart. i had to cut back close to a foot to find good wire to splice a new plug in.
and the plug going into the dimmer switch may be bad. being on the floor the plug and wires will collect a lot of dirt and water causing corrosion in the terminals, and wires. i lost the headlights on my 88. when i took the switch out the plug and wires fell apart. i had to cut back close to a foot to find good wire to splice a new plug in.
Thread Starter
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Fleet Mechanic
Joined: Nov 2022
Posts: 1,697
Likes: 416
check the bulbs, the low circuit may be bad.
and the plug going into the dimmer switch may be bad. being on the floor the plug and wires will collect a lot of dirt and water causing corrosion in the terminals, and wires. i lost the headlights on my 88. when i took the switch out the plug and wires fell apart. i had to cut back close to a foot to find good wire to splice a new plug in.
and the plug going into the dimmer switch may be bad. being on the floor the plug and wires will collect a lot of dirt and water causing corrosion in the terminals, and wires. i lost the headlights on my 88. when i took the switch out the plug and wires fell apart. i had to cut back close to a foot to find good wire to splice a new plug in.
I have new headlights on it, but I haven't checked the plug, I'll do that and see if it helps
1st Gear
Joined: May 2023
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Did you ever get this fixed? I recently had this issue with my low beams on an 89 7.3 F350. That era of Fords used the single bulb for both High/Low beam, meaning that they shared a ground through the bulb. I checked for power at the lights and found that the low beams weren't getting any power. Tested it back to the dimmer switch, it wasn't working properly so no power was going to the low beam wires. Worked after replacing the dimmer switch.
Here is a diagram similar to the one I used for the testing: https://www.chanish.org/wp-content/u..._diagram_4.gif
Here is a diagram similar to the one I used for the testing: https://www.chanish.org/wp-content/u..._diagram_4.gif
Thread Starter
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Fleet Mechanic
Joined: Nov 2022
Posts: 1,697
Likes: 416
Did you ever get this fixed? I recently had this issue with my low beams on an 89 7.3 F350. That era of Fords used the single bulb for both High/Low beam, meaning that they shared a ground through the bulb. I checked for power at the lights and found that the low beams weren't getting any power. Tested it back to the dimmer switch, it wasn't working properly so no power was going to the low beam wires. Worked after replacing the dimmer switch.
Here is a diagram similar to the one I used for the testing: https://www.chanish.org/wp-content/u..._diagram_4.gif
Here is a diagram similar to the one I used for the testing: https://www.chanish.org/wp-content/u..._diagram_4.gif
These are my lows, highs are all the LEDs on
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Tdunn65
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May 3, 2020 10:07 AM
