Fog light mod

Scaryfast · 03-08-2006, 08:36 AM

I finished the fog light mod. Thanks to K2audi for posting his experience on this modification.

This allows me to run my parking lights along with the fogs as daytime running lights for safety when driving two-lane roads. The mod does not change the high beam disable of the fog lights or the 'lights left on' warning chime.

I found that you only need one add-a-circuit fuse tap to complete this modification. Autozone had this part for $5.99. I cut off the original crimped butt connector and added a male blade connector. I did file the edges of the blade connector to make it narrower (like a fuse blade).

I used the #39 fuse circuit as my hot tap as did K2audi. I removed the 15 amp fuse from the #39 slot and the 15 amp fuse from the #36 fog light circuit. I placed those fuses in the add-a-circuit tap. So, in the tap, the first 15 amp fuse provides protection to the #39 hazard circuit, and the second 15 amp fuse delivers power and provides protection for the fog lights via the red supply wire. Basically the add-a-circuit replaces the #36 fuse holder. You just plug the bladed supply wire in the right side of the #36 holder. This is important. The left side is linked to the relay that provided power to the fogs only when the headlights were on. When the headlights are off, the relay is grounded at one end of the coil. As a result, if the supply is connected to the left side, it will blow the fuse.

First, I plugged the blade connector in the right side of the #36 fog light circuit. This way, it is not hot while I'm making the connection. Second, I plugged the add-a-circuit tap into #39. That's it; attempt at your own risk.

The switch physically functions the same way. However, with the switch in the parking light position, the fogs come on when the switch is pulled out (yes, front and rear).

K2audi · 03-08-2006, 11:27 AM

audiallroadin' · 03-08-2006, 11:44 AM

2002ar · 03-08-2006, 01:25 PM

uber_ar · 03-08-2006, 02:25 PM

You still need to pull the switch out to the second position for the rears to come on.

uber_ar · 03-08-2006, 03:34 PM

pdxroad · 03-09-2006, 01:40 PM

...you turn off the ignition? Do the fog lights stay on or do they turn off leaving the park lights still on?

Scaryfast · 03-09-2006, 02:17 PM

Thank you.

When the ignition is off, the fog lights, if pulled on, remain on with the parking lights.

However, you could change this behavior. I chose the power supply from the #39 hazard circuit which has constant power. You could tap a different circuit that is only hot when the ignition is on, and then the fog lights would only be supplied with power and functional when the ignition is in that position.

03-08-2006, 08:36 AM	#1
Scaryfast New Member Garage is empty, add now Join Date: Nov 2005 Posts: 7	Fog light mod I finished the fog light mod. Thanks to K2audi for posting his experience on this modification. This allows me to run my parking lights along with the fogs as daytime running lights for safety when driving two-lane roads. The mod does not change the high beam disable of the fog lights or the 'lights left on' warning chime. I found that you only need one add-a-circuit fuse tap to complete this modification. Autozone had this part for $5.99. I cut off the original crimped butt connector and added a male blade connector. I did file the edges of the blade connector to make it narrower (like a fuse blade). I used the #39 fuse circuit as my hot tap as did K2audi. I removed the 15 amp fuse from the #39 slot and the 15 amp fuse from the #36 fog light circuit. I placed those fuses in the add-a-circuit tap. So, in the tap, the first 15 amp fuse provides protection to the #39 hazard circuit, and the second 15 amp fuse delivers power and provides protection for the fog lights via the red supply wire. Basically the add-a-circuit replaces the #36 fuse holder. You just plug the bladed supply wire in the right side of the #36 holder. This is important. The left side is linked to the relay that provided power to the fogs only when the headlights were on. When the headlights are off, the relay is grounded at one end of the coil. As a result, if the supply is connected to the left side, it will blow the fuse. First, I plugged the blade connector in the right side of the #36 fog light circuit. This way, it is not hot while I'm making the connection. Second, I plugged the add-a-circuit tap into #39. That's it; attempt at your own risk. The switch physically functions the same way. However, with the switch in the parking light position, the fogs come on when the switch is pulled out (yes, front and rear). __________________ Paul '02 allroad 2.7T Tip

03-08-2006, 11:27 AM	#2
K2audi AudiWorld Super User Garage is empty, add now Join Date: Feb 2004 Posts: 2,465	nice!...that makes it even cheaper. __________________ 2007 Q7 4.2, Garnet Red - The 1st customers to do Audi European Delivery 12/11/2006 20 in. wheels, Navigation, Panorama Sunroof, Cold Weather Package, Technology Package, A.M.I. Satellite Radio, Tow Package, Clear Rear Tail Lights, Tint Windows %35 Front 2006 S4 Avant, Sprint Blue, 6sp. Manual, (Summers)- OEM Titanium 5-arm Rotor Design Wheels w/ Conti DWS's, (Winters) - OEM BBS CH's w/ Pirelli P-Zero Nero's, Premium Pack., Audio Pack., Cold Weather Pack., RNSE, Rear Parktronic, Carbon Fiber Belt Trim, Euro Tails, 25% Tint, RS4 Pedals "Gone but not Forgotten" 2002 allroad "Olympic Edition" Sprint Blue 2.7T w/ tip 2006 A4 Avant, S-Line w/ DTM front bumper "Vorsprung durch Technik" "Any car that merely takes you from A to B does not go far enough." - August Horch

03-08-2006, 01:25 PM	#4
2002ar Member Garage is empty, add now Join Date: Nov 2001 Posts: 563	Good show, but having the rear fogs come on is a MAJOR problem, IMHO.

03-08-2006, 02:25 PM	#5
uber_ar AudiWorld Super User Garage is empty, add now Join Date: May 2004 Posts: 2,505	Re: Good show, but having the rear fogs come on is a MAJOR problem, IMHO. You still need to pull the switch out to the second position for the rears to come on. __________________ See my old posts under a rr_allroad Check out allroadFAQ.com for info and more... Check out My allroad Owners Diary on allroadFAQ.com

03-08-2006, 03:34 PM	#6
uber_ar AudiWorld Super User Garage is empty, add now Join Date: May 2004 Posts: 2,505	added to > allroadFAQ.COM __________________ See my old posts under a rr_allroad Check out allroadFAQ.com for info and more... Check out My allroad Owners Diary on allroadFAQ.com

03-08-2006, 11:44 AM	#3
audiallroadin' AudiWorld Senior Member Garage is empty, add now Join Date: Sep 2004 Posts: 766	cool...thanks for the writeup. __________________ 1980 Audi 4000 1985 Audi 4000S 1999.5 Audi A4 2.8 2003 Audi allroad H-Sports (Hard) Tints- Front 4- 35% Rear 3-20% EBC Ultimax BlackDash USR Slotted Rotors EBC RedStuff Ceramic Pads Sirius Satellite Radio- Starbase unit (hardwired)

03-09-2006, 01:40 PM	#7
pdxroad New Member Garage is empty, add now Join Date: Apr 2004 Posts: 121	Good write-up. What happens when... ...you turn off the ignition? Do the fog lights stay on or do they turn off leaving the park lights still on? __________________ 2004 Alpaka 2.7T, TIP, beige/light brown cold, XM, premium Hartmann F1's (18") and Michelin Sport A/S OEM single-spoke and Dunlap M3's (winter) H-sports on 'hard' Tip Chip (GIAC) WeatherTech Cargo Liner Ultimate Cup Holders Yakima Rack [Viper bike mounts] Yakima Hitch mounted rack [Kingpin 2] Packasport cargo box Class II Hitch w/1-1/4" insert to custom 2" receiver IceLink w/XM and in-dash CD Changer still working! Euro [half convex] Drivers side mirror [heated, dimming] 35% tinting all around, even sunroof DRL fog lights

03-09-2006, 02:17 PM	#8
Scaryfast New Member Garage is empty, add now Join Date: Nov 2005 Posts: 7	Re: Good write-up. What happens when... Thank you. When the ignition is off, the fog lights, if pulled on, remain on with the parking lights. However, you could change this behavior. I chose the power supply from the #39 hazard circuit which has constant power. You could tap a different circuit that is only hot when the ignition is on, and then the fog lights would only be supplied with power and functional when the ignition is in that position. __________________ Paul '02 allroad 2.7T Tip

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