ND4's Fog Light Anytime Mod... NO splicing, No Bending, 100% reversible

Rocksteady1 · Feb 27, 2019

nd4spdbh[OP] initial post: ↑

Back story:

Well as we all know, there are various ways to do the fog light any time mod, from splicing to some wire in the main harness and having to bend one of the legs of the fog light relay etc etc.

I didnt like any of that for the very reason i could not go back to 100% stock. I didnt want to bend the leg on the relay and i didnt want to splice into the harness... why? Truck is brand new and if i wanted to take her into the dealer i wanted to be able to put it 100% back to stock without having to buy a second non bent factory relay. So i got to thinking and took some ideas from some other variants on the fog light anytime mod and came up with this described below... truth be told im surprised no one has done this before.

ACTUAL MOD:

Essentially i created 4 extensions with some male and female blade crimp connectors.

3 of these extensions go back into the original socket where the fog light relay went, colors are of the wires i used to extend the harness:

(GREEN) the switched ground thats activated by the switch in the dash

(WHITE) constant 12v from battery

(YELLOW) Switched 12v to the fog lights

The last extension (BROWN) goes to a switched on ignition 12v hot, this can be pulled from many places, But its exceptionally easy to grab it from the big AC relay for the dc-ac inverter... its EVEN EASIER on the tacomas (mine is a 13 DCSB TRD OR) which have the external small relay box which just so happens to have the Fog light relay and AC inverter relay.
(See here for which hole the bent pin goes into -> https://www.tacomaworld.com/threads...g-100-reversible.309407/page-27#post-10852290)

Simply make the extension with a thin blade connector and bend it so the barrel part of the crimp connector clears the relay. And walla... done, fog lights that you can turn on any time the key is in the on position regardless of what light mode you are in, fog lights that turn off with the key, AND fog lights that dont randomly turn on for a minute every 4 hours for some test procedure.

Modifications / Variations on the original Mod

If your fog relay is not in the AC/DC box check here and use the horn relay - https://www.tacomaworld.com/threads...g-100-reversible.309407/page-39#post-18445182

If you do not have a dc-ac converter relay, check post 15 for an alternate source for a switched 12v

If you want the fogs to turn on / off when switched to headlights regardless of high or low beam, check post 39 for the variation

Check here for the super stealth way to do this mod!!!

Notes:

A standard width blade connector will not fit into the stock ground socket (green wire to relay box), simply take a pair of snips and chop off some width of the connector. The main power (white) and (yellow) are full width and you will have no issues.

The AC-DC inverter relay works in an interesting way, You can use my pictures below to see which leg you need to pull off of for a truck with the external relay box, but if you are doing this mod on a truck where the fog light / ac-dc inverter relay is in the main fuse box double check which one is actually the switched 12v on ignition for the dc-ac relay. Reason i say this is, with the key off both of the legs of the relay that operate the switch of the relay will read 0 volts, put the key in and turn it on both of the legs will read 12v (wtf?!?! you might say), Press the ac-dc inverter switch on the dash and one of those legs drops to 0 volts and switches the relay on... YOU DO NOT want the leg that drops to 0 when the dash button is pressed... you want the leg that goes to 12v when the key is on and stays at 12v when the ac-dc inverter is pressed.

No extra inline fuses are necessary... they would be pointless as everything is already fused to begin with. This will not blow any fuses as the extra draw from the hot from the ac-dc relay is probably less than a TENTH of an amp.

For a picture of how the bent male blade connector is placed in the relay socket see the first attached picture in post 15

All in all it took about 4x as long to write up this thread compared to actually doing the mod.

1st pic is showing where the wires are going

2nd pic shows how the male blade connector is bent so it will fit in the proper socket along with the AC-DC relay

3 pic shows the relay tucked away in its new home.

Click to expand...

nd4spdbh[OP] initial post: ↑

Back story:

Well as we all know, there are various ways to do the fog light any time mod, from splicing to some wire in the main harness and having to bend one of the legs of the fog light relay etc etc.

I didnt like any of that for the very reason i could not go back to 100% stock. I didnt want to bend the leg on the relay and i didnt want to splice into the harness... why? Truck is brand new and if i wanted to take her into the dealer i wanted to be able to put it 100% back to stock without having to buy a second non bent factory relay. So i got to thinking and took some ideas from some other variants on the fog light anytime mod and came up with this described below... truth be told im surprised no one has done this before.

ACTUAL MOD:

Essentially i created 4 extensions with some male and female blade crimp connectors.

3 of these extensions go back into the original socket where the fog light relay went, colors are of the wires i used to extend the harness:

(GREEN) the switched ground thats activated by the switch in the dash

(WHITE) constant 12v from battery

(YELLOW) Switched 12v to the fog lights

The last extension (BROWN) goes to a switched on ignition 12v hot, this can be pulled from many places, But its exceptionally easy to grab it from the big AC relay for the dc-ac inverter... its EVEN EASIER on the tacomas (mine is a 13 DCSB TRD OR) which have the external small relay box which just so happens to have the Fog light relay and AC inverter relay.
(See here for which hole the bent pin goes into -> https://www.tacomaworld.com/threads...g-100-reversible.309407/page-27#post-10852290)

Simply make the extension with a thin blade connector and bend it so the barrel part of the crimp connector clears the relay. And walla... done, fog lights that you can turn on any time the key is in the on position regardless of what light mode you are in, fog lights that turn off with the key, AND fog lights that dont randomly turn on for a minute every 4 hours for some test procedure.

Modifications / Variations on the original Mod

If your fog relay is not in the AC/DC box check here and use the horn relay - https://www.tacomaworld.com/threads...g-100-reversible.309407/page-39#post-18445182

If you do not have a dc-ac converter relay, check post 15 for an alternate source for a switched 12v

If you want the fogs to turn on / off when switched to headlights regardless of high or low beam, check post 39 for the variation

Check here for the super stealth way to do this mod!!!

Notes:

A standard width blade connector will not fit into the stock ground socket (green wire to relay box), simply take a pair of snips and chop off some width of the connector. The main power (white) and (yellow) are full width and you will have no issues.

The AC-DC inverter relay works in an interesting way, You can use my pictures below to see which leg you need to pull off of for a truck with the external relay box, but if you are doing this mod on a truck where the fog light / ac-dc inverter relay is in the main fuse box double check which one is actually the switched 12v on ignition for the dc-ac relay. Reason i say this is, with the key off both of the legs of the relay that operate the switch of the relay will read 0 volts, put the key in and turn it on both of the legs will read 12v (wtf?!?! you might say), Press the ac-dc inverter switch on the dash and one of those legs drops to 0 volts and switches the relay on... YOU DO NOT want the leg that drops to 0 when the dash button is pressed... you want the leg that goes to 12v when the key is on and stays at 12v when the ac-dc inverter is pressed.

No extra inline fuses are necessary... they would be pointless as everything is already fused to begin with. This will not blow any fuses as the extra draw from the hot from the ac-dc relay is probably less than a TENTH of an amp.

For a picture of how the bent male blade connector is placed in the relay socket see the first attached picture in post 15

All in all it took about 4x as long to write up this thread compared to actually doing the mod.

1st pic is showing where the wires are going

2nd pic shows how the male blade connector is bent so it will fit in the proper socket along with the AC-DC relay

3 pic shows the relay tucked away in its new home.

Click to expand...

Have to say this looks the best of all the ways done. Thank you for the contribution!!!! This is the way for me.

Bigpat_ca · Feb 28, 2019

Anyone have a link to a step by step or even a video.

gotblika · Feb 28, 2019

Bigpat_ca said: ↑

Anyone have a link to a step by step or even a video.
Click to expand...

sure... click here -> 1

Bigpat_ca · Mar 1, 2019

gotblika said: ↑

sure... click here -> 1
Click to expand...

Not quite a step by step. Thanks though

llama · Mar 25, 2019

Does anyone know the part number for the ACDC relay? I was a little too aggressive putting it back in and ruined it.

gotblika · Mar 25, 2019

llama said: ↑

Does anyone know the part number for the ACDC relay? I was a little too aggressive putting it back in and ruined it.
Click to expand...

Can’t help with p/n, but I trimmed the blade connector then bent it alittle and placed it beside the female receptor of the inverter relay. Hope that makes sense.

Rick_Taco · Mar 26, 2019

llama said: ↑

Does anyone know the part number for the ACDC relay? I was a little too aggressive putting it back in and ruined it.
Click to expand...

Is this what you are looking for?

https://www.partsgeek.com/gbproduct...l6GCh3V2gyTEAQYASABEgKYgvD_BwE&ad=47584901292

gotblika · Mar 26, 2019

llama said: ↑

Does anyone know the part number for the ACDC relay? I was a little too aggressive putting it back in and ruined it.
Click to expand...

Part# 90080-87024
should be printed on side of relay, double check.

llama · Mar 26, 2019

Thanks for the help guys. For anyone searching in the future, on my 2015 TRD Off Road it is indeed part number 90080-87024.

TacoJoeBro · May 12, 2019

I did this on my 2012. I swapped wires for the Air Pump HTR for power when key is on. Well last camping trip, fog lights turned themselves on with truck off and keys in my pocket. Does this circuit randomly energize on its own for emissions or some other purpose? Anybody else experience this?

nd4spdbh · May 12, 2019

TacoJoeBro said: ↑

I did this on my 2012. I swapped wires for the Air Pump HTR for power when key is on. Well last camping trip, fog lights turned themselves on with truck off and keys in my pocket. Does this circuit randomly energize on its own for emissions or some other purpose? Anybody else experience this?
Click to expand...

quite possible. You have a TRD OR, why not use the AC/DC relay switched power considering we know its switched on and off 100% of the time with the key.

TacoJoeBro · May 12, 2019

nd4spdbh[OP] said: ↑

quite possible. You have a TRD OR, why not use the AC/DC relay switched power considering we know its switched on and off 100% of the time with the key.
Click to expand...

Thanks. I've gotten good at remembering to turn them off now. But the AC/DC source will give me piece of mind. I'll go this route now. Makes me wonder how many time this happened after I parked in garage. Only noticed this time because it lit up campsite. They turned on roughly 10-15 minutes after I parked truck.

tacofish · May 12, 2019

TacoJoeBro said: ↑

I did this on my 2012. I swapped wires for the Air Pump HTR for power when key is on. Well last camping trip, fog lights turned themselves on with truck off and keys in my pocket. Does this circuit randomly energize on its own for emissions or some other purpose? Anybody else experience this?
Click to expand...

When I did the mod on my 05 it did this
Tacos run the emissions even when the truck is off is what I am told
One night it did this when my neighbor was walking her dog
Scared the s##t out of her
On my 14 I ran it to the AC relay

cromag27 · Jul 19, 2019

will this mod allow me to use the factory fog switch ONLY when the ignition is turned on? i don’t want to have to remember to turn the lights off every time i shut off the truck.

gotblika · Jul 19, 2019

cromag27 said: ↑

will this mod allow me to use the factory fog switch ONLY when the ignition is turned on? i don’t want to have to remember to turn the lights off every time i shut off the truck.
Click to expand...

Yes

Skymaster · Jul 22, 2019

Does this work for the 3rd gens as well. I have not read the 42 pages

nd4spdbh · Jul 22, 2019

Skymaster said: ↑

Does this work for the 3rd gens as well. I have not read the 42 pages
Click to expand...

No.... in typical 3rd gen fashion they have over-complicated everything.... What used to be a simple switched ground on the dash with a 12v line based off of a low beam light.... is now a ground switched Fog relay by the ECU which determines if its OK or not to ground out the relay regardless of the switch position on the stalk. There is a 3rd gen fog light anytime mod, but you are gonna be cutting the harness.

labrador01 · Aug 15, 2019

I did this mod last night. Had to be able to test my KC fogs without my headlights!

BuildbyBarz · Sep 28, 2019

Would 14 awg wire work? Or what awg wire I should use ?

gotblika · Sep 28, 2019

BuildbyBarz said: ↑

Would 14 awg wire work? Or what awg wire I should use ?
Click to expand...

14 is more than enough.

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ND4's Fog Light Anytime Mod... NO splicing, No Bending, 100% reversible

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