Headlights
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New User
Joined: Jul 2020
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Headlights
So guys I need some help! I recently purchased new headlights and led bulbs to replace my sealed beam halogen! I tried installing them and everytime I try to turn them on my low beams keep blowing the fuses!! My high beams work perfectly but low are blowing every time! Now the leds I have don’t have a ballast connected to them so I’m wondering do I need to get some with that or what? That’s what I’m guessing my problem is but I would love to hear what y’all have to say!
Postmaster
Joined: Nov 2015
Posts: 4,807
Likes: 125
From: Colorado Springs
Welcome to the Forum.
It would help if you told us what year/model truck you have …. What lights and fixtures did you buy? I went with Truck-lites, in my 99 7.3L, here’s my thread: https://www.ford-trucks.com/forums/1...tes-led-s.html
It would help if you told us what year/model truck you have …. What lights and fixtures did you buy? I went with Truck-lites, in my 99 7.3L, here’s my thread: https://www.ford-trucks.com/forums/1...tes-led-s.html
Fleet Mechanic
Joined: Nov 2015
Posts: 1,487
Likes: 217
The LEDs are most likely pulling too much amperage. Or you have a short to ground
did you try doing it with the bulbs just hanging on the wiring? Maybe when you’re stuffing the headlight back in it’s crushing the wires?
did you try doing it with the bulbs just hanging on the wiring? Maybe when you’re stuffing the headlight back in it’s crushing the wires?
Thread Starter
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New User
Joined: Jul 2020
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I did try it before I put the housings in the truck so I’m pretty sure it isn’t a short! The leds didn’t come with a ballast resistor or anything just bulb and wire. That’s why I’m guessing I need to get a resistor or something because as soon as I clicked my lights on with the led the fuse blew in my low beam! I replaced the fuse and put the halogen back in and it worked fine
Thread Starter
|
New User
Joined: Jul 2020
Posts: 15
Likes: 1
Welcome to the Forum.
It would help if you told us what year/model truck you have …. What lights and fixtures did you buy? I went with Truck-lites, in my 99 7.3L, here’s my thread: https://www.ford-trucks.com/forums/1...tes-led-s.html
It would help if you told us what year/model truck you have …. What lights and fixtures did you buy? I went with Truck-lites, in my 99 7.3L, here’s my thread: https://www.ford-trucks.com/forums/1...tes-led-s.html
Fleet Mechanic
Joined: Nov 2015
Posts: 1,487
Likes: 217
I did try it before I put the housings in the truck so I’m pretty sure it isn’t a short! The leds didn’t come with a ballast resistor or anything just bulb and wire. That’s why I’m guessing I need to get a resistor or something because as soon as I clicked my lights on with the led the fuse blew in my low beam! I replaced the fuse and put the halogen back in and it worked fine
Thread Starter
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New User
Joined: Jul 2020
Posts: 15
Likes: 1
my high beam was working the whole time just my low wasn’t, then I did try it on the battery and both worked fine!
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Fleet Mechanic
Joined: Nov 2015
Posts: 1,487
Likes: 217
you’re drawing too much amperage for the rating of the fuse in the low beam circuit. Basically you need to make yourself that heavy duty wiring harness or buy one. Or if you’re electrically inclined you basically need to wire the LED bulbs through a relay and use the low beam positive as the turn on for the relays.
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