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Author Topic: Rear Fog Light, 2000ie.  (Read 1513 times)
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gengis
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« on: August 06, 2013, 08:43:45 PM »

I have a high resistance fault with the power feed to the rear fog light switch.  Problem is...I only have the Haynes manual diagrams, which it does not cover.  Is there anywhere I can download the appropriate diagrams, or does someone happen to have the circuit diagrams in their head?

This may save me doing open heart surgery to the dashboard wiring.

Thanks.
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
gengis
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« Reply #1 on: January 06, 2014, 11:41:00 PM »

Well I got to the bottom of this problem tonight...why is the wiring so complicated? 

The rear fog light switch supply passes through a normally closed contact on a externally mounted relay, which is controlled by the main beam circuit.  Which means that the fog light is supplied via the dipped beam circuit, but whenever the main beam is on the supply to the fog light is dropped out!!...why?

Problem was a high resistance contact in the externally mounted relay...geez.
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
Hawk
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« Reply #2 on: January 07, 2014, 12:55:08 PM »

The rear fog light switch supply passes through a normally closed contact on a externally mounted relay, which is controlled by the main beam circuit.  Which means that the fog light is supplied via the dipped beam circuit, but whenever the main beam is on the supply to the fog light is dropped out!!...why?

The thinking behind this was to ensure that high intensity rear lights were not left on when not required.  In thick fog your main beam reflects from the fog actually reducing visibility so it follows (ishy kind of) that if you can use main beam you no longer need rear fog lights.  

I have to stop typing now or this post may end in a rant about most motorsists inability to use fog lights correctly Wink
« Last Edit: January 08, 2014, 09:10:18 AM by Hawk » Logged
thecolonel
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« Reply #3 on: January 07, 2014, 10:16:48 PM »

 Totally agree,
if it's clear enough for main beam
you don't need rear fog.
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gengis
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« Reply #4 on: January 07, 2014, 11:24:49 PM »

Ah I see...makes sense.
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1983 - Lancia Beta Coupe
1982 - Fiat 124 Spider
2012 - Alfa Romeo Mito
2011 - Fiat Fiorino
2006 - BMW F800st
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