Originally Posted by c00k1e
i WOULD HAVE THOUGHT THAT FOG LIGHTS Are best when low down. SOmeone (Ari?) changed their center brake light to fog I believe.
Yeah, I confess...
I converted the OEM centermost taillight bright (21W) filament into fog-light and also as third brake light.
From factory the center bulb comes with two filaments (5W/21W) and only the 5W filament is used for regular taillight. It is very easy to take the 21 W filament into brake light use by simply stealing the brake light power from the neighboring bulbs.
By using a diode it is also very simple to make the connection in such way that the center bulb can be fed separately through a switch and kept it lit continuously in a fog etc.
In the attached pictures you can see the principle:
The center bulb in the one on the left in the photos. The diode ( a 5-10 Amp for instance) is installed between the stock brake light and the new center one in such way that the current flows one way from the OEM brake light towards the new brake light but not vice versa.
Then the new center brake light is separately powered by a 12 V through a switch and when the switch is on only this one bulb is lit. The diode prevents the other two bulbs to be powered.
I attach also a small picture of my wiring schematics. (The diode is 10 D1 and the fog light power supply is through cable 10 C3 while the brake light power is fed through 10 C5)
I also had the luggage rack brake light connected the way Simon asked about but I did not like it (or to be honest: I was afraid the local police officers might not like it as it was too bright and gave the impression that iI was riding constantly with my brake lights on..)