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Am i lighting up the night in a bad way

Discussion in 'Truck & Equipment Repair' started by CGLC, Dec 16, 2008.

  1. CGLC

    CGLC Senior Member
    Messages: 102

    I installed 2 55 watt fog lights to the back of my truck a couple of weeks ago. The lights run off my second battery and they have a 15amp fuse. I installed a toggle switch in the truck and ran extra wire to the back of the truck where I mounted the lights. Today I installed two more lights (same kind) up by the tool box (for the Salter) and I just spliced into the hot wire I ran down through the frame. I turned them on for 15 min and blew the 15 amp fuse . I cut the old fuse out and put in a 20amp, I want to know if I could hurt anything by doing this. Thanks
    Last edited: Dec 16, 2008
  2. vegaman04

    vegaman04 Senior Member
    Messages: 378

    12 watts = 1 amp @12vdc.

    So 55/12vdc = 4.58amps per light

    4 lights = 18.33amps total.

    Ok to run a 20amp fuse, but what size gauge wire do you have? This is the most important question.....
  3. CGLC

    CGLC Senior Member
    Messages: 102

    stock that came with the lights from battery to fuse 1 foot about small size wire . Then thicker from fuse to back of the truck 10 feet then smaller again to lights. Smaller size a little thicker then the long pasta nodels. The larger is bigger. Sorry for the really bad description.
  4. Pennings Garden

    Pennings Garden Senior Member
    from VA
    Messages: 242

    I have seen a truck burn to a total loss because the owner did not use a heavy enough wire for a whelen light bar (it was a brand new truck too). Don't be stupid & cheap and go with a light gauge wire, It's not worth it... fuses are there for a reason, put the 15 back in or change the wiring

    IPLOWSNO PlowSite.com Addict
    Messages: 1,620

    x2 do you have a relay?
  6. ffplow

    ffplow Junior Member
    Messages: 25

    Definetly put a relay in there, very easy to do. Run 16 or 14 guage wire for the 20 amp circuit with a 20 amp fuse. Solder all connections. Have fun driving.
  7. 04superduty

    04superduty PlowSite.com Addict
    Messages: 1,354

    you need to find out what guage wire you are using, not if its thin or thick. i always go overkill on wiring, that way i make sure that the fuse is the weak link and is the first to blow.
    also, on a long run from the front of your truck to the rear you want step up a size.