Adding a rear fog lamp; adding a relay holder

Good afternoon, everyone.

I've added a rear-facing fog lamp to my 2024, and the project has stalled with the wiring.

I'm not unfamiliar with the circuit necessary, but I'm having trouble finding the right place to get switch power. Engineer-head: "I've got power (wires from the engine box to the light), but I'm struggling a bit with control wiring."

As I understand the local law, a rear-facing fog has to be tied to the taillight circuit. That is, the rear fog can't be on without the standard taillights being on. I understand that. Given that, I could tap the taillight fuse to power the switch, to power the relay, to power the lights. No sweat.

What I'd prefer to do, though, is to make it such that the rear fog comes on when the front fogs are turned on. I'm not sure how to go about that without cutting/tapping into a wire, and I'm just not going to do that. I've found the fuse for the front fogs, but it's energized all the time, so that's not as helpful as I had expected. I need to get into the circuit after the relay, or to tap the relay, and I just don't see a convenient way to do that.

Anyone done this?

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Second topic: the Caliraisedled relay holder.

I bought one. I like it. I know where I want to attach it, but I don't see two threaded holes readily available.

There's a pic on CR's web site of one installed -- but I can't tell enough from it. Maybe that pic isn't even of a T4R installation, I don't know. For now, it's attached to the inner fender panel, ahead of the hood strut mount (and rearward of the big fuse box), but with only one bolt. I can make that work, but it's unprofessional.

Who's installed one in their 5th gen, and where did you install it? Share a pic or two?

Thanks, all.


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ETA: I may have just found the answer to the second topic. CR's web site states, "2020+ 4Runner will need to relocate accessory fuse box." In that case, I've got some more work to do.

 

Hi. In your situation I would do one of the following (in order of preference.)

1. Ignore the legal aspects and put the rear fog light on its own switch. That way there is the possibility of using the light anytime at your convenience. Plus you can run power from wherever you want and leave the fuse panels alone.

2. I wouldn’t be afraid to cut/splice/tap into wiring. I’ve always felt that fuse taps were a dodgier solution than a Positap™ or crimp connectors. If your worry is causing confusion amongst the various modules and getting trouble lights on the display, plenty of folks get those using fuse taps. The modules don’t care how you’ve molested the wiring. The key is to tread lightly. I think if you just tap into the wires powering the fog lights and use them to power the signal side of a relay it will be fine.

 

Curious to see what your rear fog lights look like. Care to post some pics? Thanks!

 

You could use an H11 splitter at the fog light to get the signal (something like this:

$14 Headlight Splitter, H11/H8 2‑Way Splitter Wiring Harness Male to Female for Fog Lamp Headlight High Low Beam Dual Quad Projector

https://www.amazon.com/Headlight-Splitter-Wiring-Harness-Projector/dp/B0B6Z4Y7TY). It doesn't require tapping into factory wiring but it will be a long run of signal wire.

 

I'd really like to see this, your rear facing fog light. It sounds like a terrible idea to have it come on with other lights, and not independent. Is this like a "chase light"?

 

I live in Virginia also. I use one in the trailer hitch similar to this. It was wired as a tail / brake light. I spliced the brake leads on it to the tail leads so the brighter brake light is on when the tail lights are on. Plugged into the trailer light plug on the T4R. No need to touch any T4R wires.

$17 Nilight LED Brake Light Trailer Hitch Cover Square Red Lens Brake Light Vehicle Tow Hitch Driving Brake Lamp 12 LEDs Brake Tail Light with 2" Receiver for Towing Truck RV and SUV

https://www.amazon.com/Nilight-Trai...ts_id=15737381&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY