Fog light operation, With or without? Options

[boxsterfan]

Are the fog lights supposed to work independent of the headlights?

Mine never come on unless the headlights are on.

[Mike Bellis]

The fog light relay gets it's power leg from the headlight switch and it's ground leg from the high beam fuse. When the low beams are on, the relay has power from the switch and the ground through the high beam filament. When the high beams are on, the ground turns positive and the fog relay shuts off.

This is an easy and free rewire without the purchase of an external device.
If you pull the white/blue wire off the high beam fuse and ground it, the fogs will work if any headlamp is lit. If you take the black/blue wire from the fog switch and apply power, the fog lights will work anytime (if you did the previous mod)

NOTE: there are 2 white blue wires on one terminal at the high beam fuse. one goes to the fog relay and one goes to the indicator lamp in the dash. Only disconnect the one to the fog relay and ground it. If you ground both the dash indicator for high beam will not work.

Easy! (IMG:style_emoticons/default/smile.gif)

[euro911]

NOTE: there are 2 white blue wires on one terminal at the high beam fuse. one goes to the fog relay and one goes to the indicator lamp in the dash. Only disconnect the one to the fog relay and ground it. If you ground both the dash indicator for high beam will not work.

Easy! (IMG:style_emoticons/default/smile.gif)

Huh? I haven't looked at the schematic, but wouldn't grounding a hot lead short the circuit? I'm not getting it, Mike (IMG:style_emoticons/default/confused24.gif)

[jcd914]

NOTE: there are 2 white blue wires on one terminal at the high beam fuse. one goes to the fog relay and one goes to the indicator lamp in the dash. Only disconnect the one to the fog relay and ground it. If you ground both the dash indicator for high beam will not work.

Easy! (IMG:style_emoticons/default/smile.gif)

Huh? I haven't looked at the schematic, but wouldn't grounding a hot lead short the circuit? I'm not getting it, Mike (IMG:style_emoticons/default/confused24.gif)

Mike is describing disconnecting the ground wire for the fog light relay from the high beam fuse and then taking that the ground wire for the fog light relay connecting it to a ground.

Of course the reason the factory wired the ground for the fog light relay to the high beam circuit was so you could not have the fog lights on when the high beams were on.
Back then they thought people would only want to use fog lights in the fog and high beams and fog don't work together very well. The fog reflects so much light back at you that the high beams make it harder to see. By making the fog lights only work with low beam, in the fog people would use low beams and fog lights together and be able to see better that high beams and fog lights.
Now days it seems every car that has fog lights have them on all the time, fog or no fog, high beams or low beams, day light or not. Does not seem to matter, if they have a light on the front of their car the have it turned on.

How ever you chose to wire your fog lights use them responsibly, make sure the are aimed properly and not blinding on coming traffic.

Jim

[euro911]

(1) Mike is describing disconnecting the ground wire for the fog light relay from the high beam fuse and then taking that the ground wire for the fog light relay connecting it to a ground.
...

(2) How ever you chose to wire your fog lights use them responsibly, make sure the are aimed properly and not blinding on coming traffic.

Jim

(1) OK, makes sense now.

(2) I agree. Seems like maybe eye doctors own stock in the companies that manufacture the new technology headlights ... do we really need to see 1500 ft in front of us at the sake of blinding everybody else coming the other way? (IMG:style_emoticons/default/screwy.gif)