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Courtesy Light Stuck On

Discussion in 'Lighting' started by dumontrider, Mar 3, 2012.

  1. Mar 3, 2012 at 1:26 PM
    #1
    dumontrider

    dumontrider [OP] Active Member

    Joined:
    Jan 26, 2012
    Member:
    #71464
    Messages:
    41
    Gender:
    Male
    First Name:
    Jason
    Cerritos, CA
    Vehicle:
    05 PreRunner V6, 5A, AC, 2wd
    Hey all, new member here. I recently picked up an 07 Taco PreRunner and was wiring up some LED's in the footwell and under the cab. I tapped into the courtesy power/ground wires coming out of the fuse block but about 2 days later my dome light and added LED's stuck on and wouldn't turn off. After much troubleshooting I decided to get a new fuse block from the junk yard ($220!) and try getting my power source straight from the battery. This time it was instant, my dome light won't turn off. Is it possible to overload the courtesy ground circuit and "weld" it closed? The footwell lights are 3 led's each, probably only a few milliamps. The led's under the truck are a total of 1amp. Yes I checked the polarity of everything, no fuses blown, nothing is shorted (at least outside the fuse block). The problem is the circuit is stuck closed now :confused: Any insight is appreciated... I'm about to spring for yet another fuse block and scrap the LED idea entirely, as these BCM's are expensive and fussy!
     
  2. Mar 3, 2012 at 2:06 PM
    #2
    dumontrider

    dumontrider [OP] Active Member

    Joined:
    Jan 26, 2012
    Member:
    #71464
    Messages:
    41
    Gender:
    Male
    First Name:
    Jason
    Cerritos, CA
    Vehicle:
    05 PreRunner V6, 5A, AC, 2wd
    Update: Made a diagram of how my wiring is run, edited slightly from one that "caribe makaira" posted. The only difference I see is that I tapped the ground closer to the fuse box instead of pulling the dome light out of the headliner, but the circuit shouldn't care "where" it's tapped?

    Circuit.jpg
     
  3. Mar 3, 2012 at 7:22 PM
    #3
    joes06tacoma

    joes06tacoma Well-Known Member

    Joined:
    Jan 1, 2010
    Member:
    #28588
    Messages:
    3,066
    Gender:
    Male
    First Name:
    Joe
    Central Coast, CA
    Vehicle:
    06 4x4 Off Road Access Cab v6 6spd
    LEER Shell with dome lights operated with 3 way switches, aux backup lights with relay and 3 position switch, modified wiring to compass/temp display and clock to include switch that disables dimming function (poor man's DRL solution), Scan Gauge 2
    I tried to tap into that wire to trigger a relay. My relay is probably the same amp draw as a couple of LEDS? Anyway, it didn't work. The relay would buzz as the dome lights came up to full brightness. I gave up the idea and had no damage to the truck. But that's one small gauge wire and I am sure that circuit isn't designed for much amp draw. It appears to be pulse width modulation, I doubt it's a relay due to the dimming.
     
  4. Mar 5, 2012 at 5:04 PM
    #4
    dumontrider

    dumontrider [OP] Active Member

    Joined:
    Jan 26, 2012
    Member:
    #71464
    Messages:
    41
    Gender:
    Male
    First Name:
    Jason
    Cerritos, CA
    Vehicle:
    05 PreRunner V6, 5A, AC, 2wd
    Strange update: I had previously unplugged all the LED's and the dome light was still stuck on, so today I gave up and took out all the LED's completely to sell to some friends... lo and behold the dome light works just fine. So now I have a $220 fuse block that I purchased and can't return... I thought I fried them both but now they're both working again!?
     
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