Adding extra side lights to a 900/bulb failure circuit help

monkeh · Jul 14th, 2009, 00:55

I was thinking of wiring up 5watt sidelight bulbs to where the foglights sit. Using the 21w/5w filament bulbs, If I did both sides and split them using the splice connectors, would the sudden drop on current consumption trigger the bulb failure circuit, even if the bulbs were both of same brand/age.
I would like to know how the bulb failure circuit is activated- Does it detect a current imbalance or does it detect a lack of current flow.
Im not sure if I sound correct, but I'm sure a sparky would know what I am talking about.!!

Cheers.

CTCNetwork · Jul 14th, 2009, 01:10

Hi,

I believe (and read here somewhere) that the system works on current imbalance.

Better info in the FAQ:
FAQ: Bulb Warning Sensor....

Des. . .

NI_Volvo_Nut · Jul 14th, 2009, 06:30

It works on resistance, I've added extra lights to my 740 at the rear and it works the bulb fail when one goes out. I took the power from the exsisting circuit though, as ti was only 2 x 5W bulbs i wired in.

Jul 14th, 2009, 00:55	#1
monkeh Pain in the backside Last Online: Yesterday 14:23 Join Date: Mar 2007 Location: Newport	Adding extra side lights to a 900/bulb failure circuit help I was thinking of wiring up 5watt sidelight bulbs to where the foglights sit. Using the 21w/5w filament bulbs, If I did both sides and split them using the splice connectors, would the sudden drop on current consumption trigger the bulb failure circuit, even if the bulbs were both of same brand/age. I would like to know how the bulb failure circuit is activated- Does it detect a current imbalance or does it detect a lack of current flow. Im not sure if I sound correct, but I'm sure a sparky would know what I am talking about.!! Cheers.

Jul 14th, 2009, 01:10	#2
CTCNetwork Forum Support Team Join Date: Dec 2004 Location: Liège, Belgium View Photos By: CTCNetwork	Hi, I believe (and read here somewhere) that the system works on current imbalance. Better info in the FAQ: FAQ: Bulb Warning Sensor.... Des. . . __________________ Density:- Not just a measurement ~ It's a whole way of Life.! ! ! I drive a Volvo, Please Don't Get In My Way! OldVolvos4Ever He shows up. People die. He vanishes. People should not be afraid of their governments. "He'll deliver more justice in a weekend than 10 years of your Governments should be afraid of their people... "V" courts & tribunals. Just stay out of his way." "I plan to."

Jul 14th, 2009, 06:30	#3
NI_Volvo_Nut Volvologist Last Online: Dec 6th, 2023 11:13 Join Date: Aug 2008 Location: Bangor - Norn Iron View Photos By: NI_Volvo_Nut	It works on resistance, I've added extra lights to my 740 at the rear and it works the bulb fail when one goes out. I took the power from the exsisting circuit though, as ti was only 2 x 5W bulbs i wired in. __________________ What's the matter with the car I'm driving? Can't you tell that it's out of style? Should I get a set of white wall tires? Are you gonna cruise the miracle mile?

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