Hi Guy’s
Back in 2012 I started to do a guide on how to enable / activate the second fog lamp (N/S) on a Skoda Yeti. In 2011 we had bought our first Yeti, and I had designed a circuit that would do this without affecting the Can-Bus system or risk overloading any of the vehicle control units.
Well somehow the Guide never quite got finished. Though I have sent one or two copies of the circuit out to fellow Briskodian’s who requested information having read my Briskoda Signature. So, following a request recently regarding it from “grajay”. I thought it high time I should complete it, and post it, in case it helps anyone else.
Briefly: The circuit is very simple and utilises only six components:
1 - A small relay of sufficient power (2 amps). 2 – Two diodes. 3 – two resistors. 4 – A single NPN transistor. Cost: probably less that £3
All easily obtainable [Maplins etc] and quite simple to assemble with very basic (schoolboy) abilities and a small soldering iron.
The two links below lead you to: (1) The guide to assembly and fitting, including the circuit diagram & (2) The Circuit diagram on its own.
LINK No: 1 - Guide
LINK No: 2 – Circuit
Whilst I placed the finished circuit in a small project box. You could just wrap it in “Heat Shrink” or some such, and opt for wiring it together with cable rather than a circuit board. Usual disclaimer: if you don’t know what you are doing – get someone to help that does! and carefully insulate the whole thing.
Its worth noting that the circuit is easily modified to power up other devices without affecting the Can-Bus as it draws only about 1ma (1 thousandth of an amp) to activate the circuit!. Eg; Increasing the capacity of the relay & fuse will give more power available at the output connection, but this of course uses a (physically) bigger relay with an increase in the power drawn by it. I optimised the circuit here for the power consumed by an additional 21 watt fog lamp = 1.6 amps, and this has kept the power consumed by the circuit, and its size to a minimum. It was in trouble free use for almost six years until “Tigger” moved on to look after another Yeti Family back in September.
Hope it helps some of my fellow Briskodians. Get in touch if you need any help or such…………..Tony