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Fog light harness - Aftermarket

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Sid22SR, Aug 14, 2025.

  1. Aug 14, 2025 at 5:05 PM
    #1
    Sid22SR

    Sid22SR [OP] Member

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    Mud guards, window deflectors, door bump strips and steering wheel cover. SO FAR! I've only had it for 4 days
    Hello friends! I'm installing Fog lights for the first time, ever, and they came with vague instructions. The instruction picture looks nothing like the harnesses.
    This harness design is nothing like I've seen in instructional videos. Any help would be appreciated. Pic attached.20250814_195716.jpg
     
    Last edited: Aug 15, 2025
  2. Aug 14, 2025 at 5:06 PM
    #2
    Steves104x4

    Steves104x4 Well-Known Member

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  3. Aug 14, 2025 at 5:07 PM
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    Ryan2103a

    Ryan2103a Well-Known Member

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  4. Aug 14, 2025 at 5:15 PM
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    RichochetRabbit

    RichochetRabbit Bing Bing Bing

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    You should not get rattled over it. :anonymous:
     
  5. Aug 14, 2025 at 6:21 PM
    #5
    RustyGreen

    RustyGreen A breaker point guy in a Bluetooth world

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    Please edit your title - something like "fog light wiring question" would be good.

    The word help us reserved for people who are broken down or stuck without a recovery plan. Over they years some of our great members have gone on rescue missions.

    Here is a standard relay wiring diagram.

    relay-socket-wiring-diagram-5-pin-600w.jpg
     
  6. Aug 14, 2025 at 7:44 PM
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    Tacomike18

    Tacomike18 Well-Known Member

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  7. Aug 14, 2025 at 8:42 PM
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    lostNdallas

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    This is purely a guess but the left harness looks like the control side and the right harness looks like the light side.

    The top left component looks like a switch and the one next to it with the white plug is the relay.

    The red wire from the switch would be connected to either switched or constant power, and the yellow wire would be connected to a stand alone higher amp 12v source.

    The red wire from the relay goes to the red wire on the light harness, and the two black wires go to ground.

    Have no idea what the green plug might go to. Plus the harness seems short to go all the way to the front of the truck, like it's missing a harness to go between the control and light harness.

    But again, this is all just a guess without having all the parts physically in front of me.

    20250814_195716.jpg
     
  8. Aug 14, 2025 at 8:51 PM
    #8
    airforceb2cc

    airforceb2cc Well-Known Member

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  9. Aug 15, 2025 at 5:21 AM
    #9
    Sid22SR

    Sid22SR [OP] Member

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    Mud guards, window deflectors, door bump strips and steering wheel cover. SO FAR! I've only had it for 4 days
    Thank you everyone for the insight. The yellow is marked ACC which I believe goes to a switched power fuse with a fuse tap. The Green goes through the firewall and is for the dash switch/button (picture attached).
    The real issue is that everything that I've seen on YT videos shows more connections at the inside fuse box, and this design seems to be all in the engine compartment. Thanks again!

    button.jpg

    20250814_195716.jpg
     
    Last edited: Aug 15, 2025
  10. Aug 15, 2025 at 1:06 PM
    #10
    Sid22SR

    Sid22SR [OP] Member

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    Mud guards, window deflectors, door bump strips and steering wheel cover. SO FAR! I've only had it for 4 days
    NOT working! The relay is NOT clicking. I'm not sure what's wrong.

    - Red from Relay to Fuse to (+) Battery
    - Grounds - both Grounds to frame (and meter out 12v with battery (+))
    - Red from light harness to the factory end extension, then to 2nd RED off of the Relay
    - ACC (*yellow) - added an extension wire on to the accessory (yellow) cable through the firewall and "tapped" into the p/outlet (fuse #3) 15a fuse.

    * The vague instructions never mention the yellow wire. And the harnesses look nothing like what's on the shoddy drawing.

    Any ideas? Thanks in advance!


     
    Last edited: Aug 15, 2025
  11. Aug 15, 2025 at 1:25 PM
    #11
    RustyGreen

    RustyGreen A breaker point guy in a Bluetooth world

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    Is this a 4 pin relay or 5?

    Using the resistance setting on your volt meter you should have a low resistance between the two coil terminals, # 85 & 86 in my earlier post. Note it should be a low resistance but not zero.

    Applying 12 volts to these two terminals should make the relay click.
     
  12. Aug 15, 2025 at 10:06 PM
    #12
    TacoManOne

    TacoManOne YotaWerx Authorized Tuner

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  13. Aug 16, 2025 at 1:06 PM
    #13
    lostNdallas

    lostNdallas Member

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    On my 23, there is an ign fuse on the main fuse block to tap without running a wire through the firewall.
     
  14. Aug 17, 2025 at 9:00 AM
    #14
    Sid22SR

    Sid22SR [OP] Member

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    Mud guards, window deflectors, door bump strips and steering wheel cover. SO FAR! I've only had it for 4 days
    Guys. Thanks for all of the input. It was in fact a bad relay (out of the box). Snapped a new one it and the lights worked immediately. Thanks again!

    2590891950751064907.jpg
     
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