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gtiller · 30-12-2008, 01:18 PM

Nightmare...

I have a pair of 10 ohm 50 watt resistors, and the bulb failure warning goes off

However, I also got some 5 ohms 50 watt resistors at the same time. These stop the bulb failure warning, however burn really hot

So on the grounds that the 2.7's also put out the warning, but even hotter than the 10's - it looks like there is an absolute maximum of 5 ohms before the warning sounds.

I didn't realise the system would be as sensitive as this.

Obviously, when I put the multimeter across the H7 55 watt lamp, it reads as a dead short circuit (zero).

I am thinking this, order a pair of 100 watt resisotrs with an impedance of 2.7 ohms.
This would draw 4.44 amps
Which means it will burn at 53.33 watts - half the rating of the resistor

Whilst they make even lower resistance models (as low as 0.22 ohms) I think 2.7 is a low as I dare go.

What do you reckon?
Is my maths right?

Thanks

30-12-2008, 01:18 PM	#8 (permalink)
gtiller Ford Ka Join Date: Dec 2006 Location: Location: Location Posts: 70	Nightmare... I have a pair of 10 ohm 50 watt resistors, and the bulb failure warning goes off However, I also got some 5 ohms 50 watt resistors at the same time. These stop the bulb failure warning, however burn really hot So on the grounds that the 2.7's also put out the warning, but even hotter than the 10's - it looks like there is an absolute maximum of 5 ohms before the warning sounds. I didn't realise the system would be as sensitive as this. Obviously, when I put the multimeter across the H7 55 watt lamp, it reads as a dead short circuit (zero). I am thinking this, order a pair of 100 watt resisotrs with an impedance of 2.7 ohms. This would draw 4.44 amps Which means it will burn at 53.33 watts - half the rating of the resistor Whilst they make even lower resistance models (as low as 0.22 ohms) I think 2.7 is a low as I dare go. What do you reckon? Is my maths right? Thanks __________________ Audi A6 S-Line Avant (2005) 3.0 Litre TDi Quattro Tiptronic 19" BBS wheels, MMI High, DVD SatNav, Leather Electric Heated Sports seats, 3 Spoke MFSW, Stowaway Tow Bar, rSAP phonr kit (GSM Motorola removed), LED Tail Lights Last edited by gtiller; 30-12-2008 at 01:28 PM.