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Fog lights on with Brights / Hi beams

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Black Rock Taco, Jul 12, 2009.

  1. Jul 12, 2009 at 11:39 AM
    Black Rock Taco

    Black Rock Taco [OP] Well-Known Member

    Jun 12, 2009
    Winnemucca and Reno, NV, Oakland CA
    2011 DBL Cab Tundra
    None, yet
    This mod will turn on the fog lights with the high beams. If already on, they will stay on with high beams.

    I did the Fog mod a while ago. The green wire in the pic goes to the aux fuse in the in-cab fuse block, allowing fogs to come on anytime I want. But what I really wanted is the fogs to come on with the brights. A little reading showed me the light. The Fog switch connects the ground (ground switched). From what I could find, the headlight and dim relays are positive triggered, so a simple diode bridge to the fogs won't work. So I connected a relay to the negative terminal on the Fog relay, and triggered it by the bright positive output terminal of the Dim relay. Ran the wires out the bottom of the fuse block to the relay. In the pic:
    1. First release the fuse block, approx catch locations are shown in GREEN
    2. Feed 2 wires down into fuse block through existing holes (magenta arrows), out the bottom where wire bundle exits at rear (blue arrow).
    3. RED arrow to the left points to + bright out terminal on the DIM relay. I simply shoved the end of the black wire in the pic in the slot and replaced the relay. If you want, verify that this only has 12V+ when the brights are ON. This wire goes to pin 86 of my relay.
    4. RED arrow near center of fuse block shows where I shoved the blue wire into the - (ground) trigger of the FOG relay. Replace the relay. Wire goes down the hole shown in magenta and out to pin 30 of my relay.
    5. Make sure both wires are firmly placed and won't wiggle or come out.
    6. Jumper pins 85 and 87 on the relay and run a wire from these to ground.
    7. Test everything. Fogs should operate as they did before, which will depend on other mods done. BUT they should also come on with the high beams even if they were off, and will stay on with the high beams if they were already on.
    8. Cover wires and place wires and relay in a safe location. I ran mine along the wire bundle exiting the fuse block, and zip tied the relay in the corner by the firewall.

    The other fog mods have the problem that if fogs are on in daytime, as it gets dark, they make it look like your headlights are on, and you drive around with no tail/marker/head lights at night. Dangerous and you'll get a ticket. So my next project will be to add a Directed Electronics 545T Nite Lite module (DEI 545T may get more search results). Around $45 online. Unit has a photo sensor and makes your headlights and tail lights auto on at dusk, off in daylight. Can also optionally be wired to turn tail lights on with the wipers.

  2. Sep 11, 2009 at 2:03 PM

    Krusey1011 Well-Known Member

    Jul 27, 2009
    First Name:
    K&N high performance intake, billet grill, bhlm, T-Rex eyelids, debadged/blacked, behind grill Hella Black Magic's, Fog light anytime, DTLT headers, Interior/Exterior LED's
    Havn't seen this one yet. I'm just about to do the fog light anytime mod and I might want to do this one vs the other one on here because I heard of a couple of problems that might relate to the other mod. Someone donig the other mod and also hooking up there PIAA set up to it and it burnt out there alternator. Yeah he did too much but the fogs hooking up to the green wire might do this over time. IDK tho that was the only problem I've seen so far and it's not just because of the fog light mod. I'll make up my mind here shortly. Good job tho! Props :thumbsup:
  3. Sep 11, 2009 at 2:14 PM

    T0LLPHR33 Well-Known Member

    Sep 26, 2007
    S1N C1TY...(from Hilo, HI)...
    BSP TRD Off-Road
    APR X-1 | TRD CAI w/Clear Cover | TRD Short Shifter w/ TRD "RED" Shift Knob | SGII w/Blendmount| Snugtop SL w/KeyLess Entry | 5% Tint | Pop-n-Lock | Bosch Icon WB | S2K Antenna | HRM | LS 8K Projectors w/BSP HLM & 8K Fogs w/FLM | Debadged |Tinted Tails | Black Weathertechs | MX RGM & RBM | Optima Red Top 35 | Gatorback Belt |
    cool idea...nice little mod...

    but I like being able to turn on my fogs whether or not my HID Projectors are on or off...more of a wow factor I guess...

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