R33 Fog Lights Stopped Working Last Night

[KrazyKong]

My fog lights stopped working last night. I checked the 15amp fuse under the dash today and its fine. What I do hear is this clicking sound similar to when the AC clicks on and off. It's coming from the fuses in the engine bay. Do these big lego brick things ever need replacing? The one that's for the fog lights is a light brown colour. Could it be this? or is something else going screwy.

Edited May 11, 2012 by KrazyKong

[89CAL]

Can you check there is power at the plug for the foglights and the earth is good? Relays don't often fail

[KrazyKong]

I have a multimeter but not sure how to test the plug. So I'm testing for power and earthing correct? What setting do I need to have my multimeter on then for these two?

[89CAL]

Ok go DC Voltage (its the two lines that go straight, think one is dotted) if you dont have an auto ranging multimeter make sure it will read Volts not mV or anything like that

Put negative probe on a good chassis earth and put the positive probe into the plug with the fog light switch on.One of the terminals should have about 12V (there a 3 pin plug, should be a power for indicators, power for foglights and common earth)

So if theres power at the plug, check the earth is ok. Change the multimeter to risistance (the omega symbol) and keep the negative probe on the chassis earth and probe the terminals with the positive. You should have one of them with a low resistance (OL is outer limits and means there is no circuit, you dont want this, you want 0.0ohms or similar, it will probably show more like 6ohms or so)

If you have power and earth (I'd assume you have a good earth if your indicators still work) then there is a problem with the actually light, wether it needs a new bulb or the wiring in the light assy is a bit dodgy

If there is no power there, then post up here

[KrazyKong]

Wow thanks for that mate. Will give it a go tomorrow and post back on how it turns out. A question, do both fog lights stop working, if one of them has a bad bulb? or do they work independent of each other.

[89CAL]

They are wired parallel so if one goes out the other should stay on