Fog light operation, With or without? |
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Fog light operation, With or without? |
boxsterfan |
Dec 6 2013, 06:24 PM
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#1
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
Are the fog lights supposed to work independent of the headlights?
Mine never come on unless the headlights are on. |
Mike Bellis |
Dec 6 2013, 08:53 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
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) |
Mark Henry |
Dec 8 2013, 11:36 AM
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#3
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
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) Long time member Demick did a DIY write-up on this long ago, I did this mod in the early 2000's with his instructions. I don't know if he was the originator of the the pilot fog lights and this mod, but he does deserve the props. http://members.rennlist.com/demick/fogrewire.html http://members.rennlist.com/demick/lights.html |
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