How To Install Fog Lights
By Rob Robinette
The toughest part of installing fog lights is getting the
switch wire through the firewall. I was able to get mine through at the hood opening cable
(just follow the cable from the lever under the dash to the firewall. You can simplify the
wiring by installing a Daytime
Running Light controller and skip the cockpit
mounted switch. I mounted the lights by drilling two small holes and using small self
tapping screws (see photo below).
Mounting in the nose
Wiring the lights
I bought the stock fog light switch from the dealer for $70 so it would look factory.
You have to tap into a switched power source at the fuse box. Most auto parts stores sell
little metal adapters that go on the fuses to allow you to tap into the fuse box. Run your
powered wire (and in-line fuse) from the fuse box to the fog light switch and run a wire
from the other switch terminal through the firewall to the fog light relay. This wire is
the control wire that tells the relay to power the lights. You have to use a relay because
the fog lights pull too much amperage to use a straight on/off switch. The relay has three
connections: control, ground, and power. When the relay gets power to the control terminal
it sends voltage to the power terminal. The fog light switch wire connects to the control
terminal, ground the ground terminal (see photo), and connect both fog lights to the power
terminal. Finally you have to ground the fog lights.
The relay: yellow is ground, red is
power to lights, green goes to switch in the cockpit
The factory fog light switch - $70
Want to turn your fog lights into daytime running lights? Bonus-you
don't have to run wires to a cockpit switch. See the Daytime Running Lights how-to.