Connecting the rear fog light on the A4 Jetta
I’m human and make mistakes. If you spot one in this how to, tell me and I’ll fix it This was done on my 99.5 Jetta. Your car may be, and probably is different. If you do the mod and have any insights, tell me and I’ll add them. Also, if you blow up you car doing this, please don’t blame me.
SO WHY DO THIS? I’m a believer in the See and Be Seen principle. What this mod does is use the rear fog portion of both tail lights as a brake light, and let you turn on the rear fog light on the driver’s side by itself. This is useful in inclement weather (like fog for example…) because the rear fog light is much brighter then the parking lights, and can be seen from a greater distance!
First, please read through this whole document. It’s better to have a question about how to do something before you have your car apart. What we are going to do is connect the fog lights to the brake lights so that the fogs come on at the same time as the brakes. We are also going to connect the driver’s fog so it can be switched on all by itself (as the fog should only be on one side). To do this, we need to filter the current going to the driver’s fog so that current from one system doesn’t go to another system. This is done with diodes. Current can only pass in one direction through a diode:..
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