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Backup light circuit

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Jonah, Nov 20, 2017.

  1. Nov 20, 2017 at 1:55 PM
    #1
    Jonah

    Jonah [OP] Well-Known Member

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    Joe
    Charleston, SC
    Vehicle:
    2007 TRD O/R 4x4
    5100s F&R, TSB leaf springs, N-Fab steps, bed lights
    I just finished installing these auxiliary reverse lights. I wired them directly to one of the backup lights. Now that it's done, I'm having a concern about what's on that electrical circuit. Besides these lights, I changed out the stock backup lamps to 35W bulbs a while ago. There is also a trigger wire for the backup camera connected there.

    The fuse diagram shows some other things on this circuit (air conditioning system, passenger airbag manual on- off switch, shift lock system). I can see having the A/C on while backing up, not sure about the others.

    Did I screw up and possibly overload this circuit? Do I need a relay? I'd change the backup bulbs back to stock, but I already broke 1 tab on each tail light and I fear removing them again.
     
  2. Nov 20, 2017 at 6:05 PM
    #2
    Jonah

    Jonah [OP] Well-Known Member

    Joined:
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    Joe
    Charleston, SC
    Vehicle:
    2007 TRD O/R 4x4
    5100s F&R, TSB leaf springs, N-Fab steps, bed lights
    Wow! This is the first time I've ever seen you guys speechless. :notsure:
     
  3. Nov 20, 2017 at 6:31 PM
    #3
    crashnburn80

    crashnburn80 Vehicle Design Engineer

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    Kirkland, WA
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    2015 DCSB TRD OR MGM
    Go Hawks!
    How sure are you on that diagram? I believe the 2nd gen is wired to the tow circuit and is fused at 10 amps. You’d be close to the circuit limit if that were the case and more than I’d want to pull from from the reverse lights alone. What bulbs are you running in your OEM lights?
     
  4. Nov 20, 2017 at 7:07 PM
    #4
    Jonah

    Jonah [OP] Well-Known Member

    Joined:
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    Member:
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    Messages:
    307
    Gender:
    Male
    First Name:
    Joe
    Charleston, SC
    Vehicle:
    2007 TRD O/R 4x4
    5100s F&R, TSB leaf springs, N-Fab steps, bed lights
    According to the manual, it's circuit IG1 with a 10A fuse. My reverse bulbs are GY6.35 halogen (35W each). The aux lights are each 22W LEDs. With this set up I'm at 114W or 9.5A just for the lighting. I probably need to change the 35W bulbs back to stock.

    My truck has the tow package. Is there a different circuit in the trailer connector that feeds backup lights for the trailer? I never tow, so that might be an option if it exists.
     
  5. Nov 20, 2017 at 7:26 PM
    #5
    crashnburn80

    crashnburn80 Vehicle Design Engineer

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    Kirkland, WA
    Vehicle:
    2015 DCSB TRD OR MGM
    Go Hawks!
    I’m not certain of the circuits on a 3rd gen. The safe option is to run a relay off your aux lights to the reverse circuit. If you are just looking for more light, switching to the new 35w Gy6.35 HIR produces 860 lumens compared to your Gy6.35 halogen producing 420 lumens. No increase in power draw. Or even lower the draw and increase output with the 30w Gy6.35 HIR at 750 lumens. A $12 pair of led auxiliary lights lights is going to be mainly ornamental for near field vision and not worth the tax on the circuit IMO.

    Gy6.35 HIRs:
    https://www.tacomaworld.com/threads/gy6-35-hir-921-reverse-light-upgrade-vs-high-power-leds.474996/
     

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