This mod consists in using both inner and outer tail lights for the position/parking and stop lights. Doing this will make your car much more visible especially when youíre braking as all 8 light bulbs (4 halves on each side) will illuminate. Same for the position/parking lights but using a lower intensity. Before going into the details, this mod concerns only the EURO
cars. It canít be done directly on the US
cars as their tail lights operate in a very different way.
If youíve read my previous post, http://www.ferrarilife.com/forums/modern-v8s-360-f430/16267-led-tail-lights-comparison.html
, I explained that connecting 8x21W light bulbs would require a total current of 14Amp or 7Amp on each side! This mod can only be done if you consider also to install one of the LED light bulbs. In my case, Iím using the 6W High Power Lights (permalink
) which will drain a maximum current of 4Amp for all 8 lights. On each side, that will be a maximum of 2Amp, so weíre safe as it wonít blow the fuses. Remember that with a blown stop light fuse, on a F1 car, you wonít be able to select a gear anymore.
I must say that the initial idea came from my friend Anders because he found out how to connect the internal parts of the bulb holder to make both bulbs working together. As we had to deal with the excessive current needed to illuminate all 5/21W incandescent light bulbs, the only solution was to use LED lights. The other challenge was the fog light. Fog lights are mandatory in Europe and even if there is very little chance weíre going to drive such car in the mist, fog lights have to be operational and are always checked by the inspection services. As the initial fog light was now also used as a stop light, I had to use a SPDT Reed relay between the stop and fog light. A Reed relay was fine as I needed to switch only a couple of 100mA for the LED lights.
Now that Iím using the 6W Led lights, the system must be upgraded because my Reed relays incorporated in the tail light wire harness, wonít be able to cope with such currents. The easy way would be to insert a bigger SPDT relay. As such relays are electromechanical relays, they are prone to failure and sensitive to heat. This is not something I can consider in an area like the engine bay. Finaly, itís quite easy to replace a relay using only passive electronic components. 2 diodes in parallel working as an OR gate and 2 resistors will give exactly the same results as a SPDT relay. This is a very reliable way to resolve situation where both Fog and Stop power inputs must power the same lights.
Here is the schematic of the new solution
To understand better how the tail light connectors are wired, I made this document to have a better overview Taillights Connectors.pdf
In the next posts, I will explain how to modify the wire harnesses and how to practically implement the electronic parts but here is already a picture of the final result where all electronic components are integrated in a very small thermal protected and air sealed case.