1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Led headlight resistors?

Discussion in 'Garage' started by Chops, Jul 13, 2019.

  1. Chops

    Chops Junior Member

    Posts:
    6
    Likes Received:
    3
    Joined:
    Jun 20, 2019
    Location:
    Canandaigua, ny
    First Name:
    Nick
    Truck Year:
    1983
    Truck Model:
    K20
    Engine Size:
    6.2
    I just bought some LED headlights for 83 that will not work, do I need resistors? If so which ones should i get?
     
  2. Craig 85

    Craig 85 Full Access Member

    Posts:
    1,920
    Likes Received:
    1,219
    Joined:
    Jan 25, 2017
    Location:
    Grass Valley, CA
    First Name:
    Craig
    Truck Year:
    1985
    Truck Model:
    K30 SRW
    Engine Size:
    454/TH-400/NP205
    Make sure the polarity is not reversed. Many LEDs won't work if this is not correct.
     
  3. Chops

    Chops Junior Member

    Posts:
    6
    Likes Received:
    3
    Joined:
    Jun 20, 2019
    Location:
    Canandaigua, ny
    First Name:
    Nick
    Truck Year:
    1983
    Truck Model:
    K20
    Engine Size:
    6.2
    They will come on theyre just extremely dim, if i hook it up straight to the battery they work great
     
  4. Frankenchevy

    Frankenchevy . Supporting Member

    Posts:
    3,037
    Likes Received:
    2,321
    Joined:
    Jan 3, 2018
    Location:
    usa
    First Name:
    Jeremy
    Truck Year:
    old
    Truck Model:
    pickup
    Engine Size:
    8 cylinder
    Did your previous headlights work full power?

    Check your wiring, particularly the grounds. Check voltage at the headlight plug while the truck is running.

    If the lights are coming on but just very dim, the electricity has a complete path, just not a very good one.

    Might be a good time to rework your front harness and possibly run relays for the lights.
     
  5. Chops

    Chops Junior Member

    Posts:
    6
    Likes Received:
    3
    Joined:
    Jun 20, 2019
    Location:
    Canandaigua, ny
    First Name:
    Nick
    Truck Year:
    1983
    Truck Model:
    K20
    Engine Size:
    6.2
    Ill have to do that, just wasnt to sure if maybe i needed resistors. Figured id ask that before getting to deep into the wiring, thanks
     
  6. Dave 84

    Dave 84 Supporting Member Supporting Member

    Posts:
    88
    Likes Received:
    27
    Joined:
    May 20, 2019
    Location:
    Arizona, glendale
    First Name:
    Dave
    Truck Year:
    1984
    Truck Model:
    K5
    Engine Size:
    5.7
    Resisters will make it worse I belive you all ready figured it out so you know the light works cuz you have already put it to direct power and it's good!
    It sounds like a voltage drop so get your volt meter and check your battery voltage then check the voltage right at the light and if that voltage is very low you'll need to go over all your powers also take your meter and put your negative lead straight to were your ground is for the light and your positive at the battery positive to see if you have a bad ground even with a relay(witch I highly recommend but not mandatory) this is a very simple circuit! A voltage drop is most commonly a bad connection hopefully that helped you
     

Share This Page