Fog Light Relay Control

[fredwhet]

I have a 2008 Tundra and installed factory fog lights utilizing the factory fog light wiring harness which was already installed on my truck. I am not interested in buying the factory fog light switch which is part of the steering column turn signal lever. I just want to install an on/off dash switch to control the fog lights.

I have the fog light schematic wiring diagram from one of the posts from one of the forums. I have installed a fog light light relay in the fuse compartment where the fog light relay is supposed to go. I need to find out where I can intercept the relay coil wires which tie to the fog light relay terminals #1 and #2 which control the relay. Any one have any advice on where these wires run from the factory fog light relay location? I need to disconnect them from the factory wired control to the steering column, and tie them to the new dash mounted switch in order to control the fog light relay.

[Eddie]

Fog light mod?

[fredwhet]

Hi Eddie,

I caught up to your Idea #1 and Idea #2. Are both of these proven methods? I sure do not want to harm my ECU but they appear to be OK. If I understand them, Idea #1 turns the fog lights on when the parking lights are on and Idea #2 turns them on/off via a manual switch. Is this correct? How can I have them come on when the parking light s come on and also be able to turn them off with a switch when the parking lights are on?

[Eddie]

Originally Posted by fredwhet

Hi Eddie,

I caught up to your Idea #1 and Idea #2. Are both of these proven methods? I sure do not want to harm my ECU but they appear to be OK. If I understand them, Idea #1 turns the fog lights on when the parking lights are on and Idea #2 turns them on/off via a manual switch. Is this correct? How can I have them come on when the parking light s come on and also be able to turn them off with a switch when the parking lights are on?

I just PM'd someone who was supposed to try the rewiring. I don't own a 2nd-gen Tundra but I have some electrical knowledge from working for Lexus I don't see any harm done to the body ECU since it's being bypassed,and those ECU connections are definitely grounds since the other end of the relay coil circuit connects to a fuse.

With #1 you can still turn the fogs on/off with the stock switch

[fredwhet]

Thanks Eddie, it works! I used the diagram #1 and installed a switch on the dash. Now I can turn them on or off with the manual switch and they turn off automatically when the parking lights are turned off.

Thanks again.