Adding AUX lights using the factory fog light wires
- Thread starter SINCITY100
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I just did this mod so that my LED Light Bar which is wired into the stock fog switch now stays on when I turn on my high beams.
So, now it is possible to have the low beams, high beams and LED light bar all on at the same time. Works like a champ!
So, now it is possible to have the low beams, high beams and LED light bar all on at the same time. Works like a champ!
Great mod. Thanks for the write up. I just cut the pin10/17 wire mid-loop, soldered a splice onto it, covered with heat shrink, and ran to ground at the bolt holding the lower dash steel plate.
fireball
SILVER Star
Is there a way to do this so the fog switch can be activated with parking lights on as well?
This was an easy mod for my 3rd gen 4R. I've been doing some searching and it looks like there isn't any easy way to do this on the 100?
Here's the link to the 4R mod. Same OEM setup as the LC...fogs on only with headlights and off with high beams. This mod allows them to work with parking lights, low and high beams!
http://www.top4runners.com/ja/fogmod.html
fireball
SILVER Star
Bueller ? Bueller??? Anyone know the magic wiring trick?
The OE fog light relay solenoid is enabled from two sources: ground from the pin 10/17 mod (and via the switch on the stalk) and hot from the output of the headlight relay. In looking at the EWD page 62 (in my PDF version) it shows there is a potential for a pin 19/61 mod where you could sever that loop and run the pin 61 side to a switched hot source. In theory, that would give you complete control of the fogs regardless of headlight operation. This, obviously, has not been tested so mod at your own risk.
fireball
SILVER Star
Oregon, thank you for the reply! I'll have to look in more detail at that drawling once I'm in front of the computer, but wondered what year cruiser you have or what year that wiring diagram is for.
Hopefully it is the same as my 99.
For the forerunner, all you had to do was grounded out to a taillight, which comes on with the parking lamps, so then you can use the fogs any time the parking head or high beams are on.
Hopefully it is the same as my 99.
For the forerunner, all you had to do was grounded out to a taillight, which comes on with the parking lamps, so then you can use the fogs any time the parking head or high beams are on.
I have a 2000 and a 2004, the EWD is from the downloadable FSM (2004). Light circuits should be the same across all years AFAIK.
fireball
SILVER Star
Anyone have good instructions on how to get at the fog light relay? It is located behind this conglomeration of wires:
And, FWIW, the diagram is page 64 of 482 on the EWR pdf that I downloaded from this commonly used link:
https://forum.ih8mud.com/100-series-cruisers/527487-factory-service-manual-fsm.html
And, FWIW, the diagram is page 64 of 482 on the EWR pdf that I downloaded from this commonly used link:
https://forum.ih8mud.com/100-series-cruisers/527487-factory-service-manual-fsm.html
Last edited:
2001LC
SILVER Star
I recently read in mud; behind that housing that holds the fuses. Unbolted it and could barely get hand behind it with all the wires on.
fireball
SILVER Star
After an hour of laying on my back with my head under the dash, I've got the box out and I've got the fog light relay in my hand !!
Can someone please tell me which is the pin that supplies ground from the low beam headlights?
That is the pin I will need to bend and connect to a taillight or parking lamp fuse so that they work as I'd like.
And yes, I know I should've had this figured out before I took the whole thing apart!
Can someone please tell me which is the pin that supplies ground from the low beam headlights?
That is the pin I will need to bend and connect to a taillight or parking lamp fuse so that they work as I'd like.
And yes, I know I should've had this figured out before I took the whole thing apart!
I know the Taco guys did the mod at the relay, but as long as you have the dash apart to do the pin 10/17 mod it shouldn't be that much more work to do the 19/61 mod. I don't know why, but for whatever reason I feel better about not messing with the relay block and doing the mod up at a connector. I may have time to try this on the 04 this weekend.
2001LC
SILVER Star
Hopefully someone knows and can help, I don't even have a clue if ground or positive is to be diverted.
In the meantime you may try running test wires while using a tester.
In the meantime you may try running test wires while using a tester.
Both need to be diverted. Ground to prevent high beam from deactivating and hot to enable fogs with parking.
fireball
SILVER Star
Oregon, can you please explain the Pin 10/17 and Pin 19/61 mod? I don't think I am understanding you on that.
According to the fog light diagram that Re_Guardian posted here: https://forum.ih8mud.com/showpost.php?p=7355061&postcount=34
Pin#1 of the relay gets power from the headlight low beams. So I will bend Pin#1 and connect that to the tail lamp fuse with an add-a-fuse and hope everything works as intended.
If this diagram is to be believe, pin#1 is the bottom right pin when looking at the backside or prong-side of the relay:
Oregon - maybe we are talking about doing the thing, just at different locations?
According to the fog light diagram that Re_Guardian posted here: https://forum.ih8mud.com/showpost.php?p=7355061&postcount=34
Pin#1 of the relay gets power from the headlight low beams. So I will bend Pin#1 and connect that to the tail lamp fuse with an add-a-fuse and hope everything works as intended.
If this diagram is to be believe, pin#1 is the bottom right pin when looking at the backside or prong-side of the relay:
Oregon - maybe we are talking about doing the thing, just at different locations?
The first post in this thread describes how to cut the pin 10/17 loop and run pin 10 to ground. That disables the high beams from turning off the fogs.
The pin 19/61 mod is a theoretical mod. Take 19 to a switched hot and you remove the need to have the headlights on. See post #26 above for diagram.
fireball
SILVER Star
Well I am a bit stumped. The taillamp fuse has constant 12V power. So when the lead is connected to it, the fogs work whenever. I would like them to only work with the parking lights and head lights.
I will still need to do the pin 10/17 mod because the fogs still go out with the high beams on.
I will still need to do the pin 10/17 mod because the fogs still go out with the high beams on.
Yes, you could go to hot from parking for that mode just fine.
fireball
SILVER Star
Not sure I understand.....sorry I'm a little slow...
I need to run the wire that I've already connected to the back of the fog light relay to a power source that only comes on when the tail lights are on. I thought this was going to be the 15amp TAIL fuse that is located on the visible side of the panel in the driver footwell. Unfortunately (and confusingly for me at least?) is that this fuse has constant 12v power. So if you plug into there, you can operate fog lights whenever.
I need to run the wire that I've already connected to the back of the fog light relay to a power source that only comes on when the tail lights are on. I thought this was going to be the 15amp TAIL fuse that is located on the visible side of the panel in the driver footwell. Unfortunately (and confusingly for me at least?) is that this fuse has constant 12v power. So if you plug into there, you can operate fog lights whenever.
I haven't tried but that doesn't surprise me. Most of the lights look like they are switched on the ground side of the relay. I bet if you tapped in to a parking LIGHT circuit (on the switched side of the relay, battery end) it would work as you describe. That circuit should only go hot when the parking relay closes. Don't have the diagram in front of me. I'll play with it this weekend.
