stevo1970

iTrader: (1)

Are these the right bulbs for the dash fog light switches?

Thanks

Wire Terminal Type : Small Bulbs & Lamps : Maplin

andyxros

think they are by look of them as there very tiny ad need soldering in as i found out wen i took my rear demister switch to bits (wot a pain) and my front fog aint lighting up ether so i need to get some,,, i would be greatfull if you let me know how you went on???

kingmikeyuk

not an electrical expert but i think they might blow, voltages can get up to about 14v, unless its regulated for the dash board area, hopefully someone in the know will put me right or you never know might even agree with me .

Mike D

guinnessman2001

There will be no problem with the bulbs blowing. Although the bulbs are rated at 12V, that's only a nominal value. The odd voltage fluctuation to even 14V will have no detrimental effect on the bulbs.

All the general electrics around a car will safely run at anywhere between 12 and 15V, as long of course as the wiring is capable of handling the extra current with the higher voltage.

Sensitive components such as the ecu and possibly some sensors will have dedicated internal voltage regulators so they will not be affected by any voltage fluctuations.

stevo1970

iTrader: (1)

Thanks for that i'll buy some and see how easy they are to fit. I'll be back on here to pass on.

Voltage difference 12 to 14 will not be a problem.

14V will require a smaller current to flow over 12V not larger. Simple ohms law.

joey_turbo

iTrader: (26)

These are the actual ones. Coloured Subminiature Bulbs : Small Bulbs & Lamps : Maplin Changed mine no problems.

They used to do a clear one, and you could take the coloured "condom" of the old bulb, but buying the green for the fog light logo illuminination is fine, and the yellow for the light to tell you the fogs is on.

They are easy to fit. The old bulb is wrapped around a holder, simply unravel the old one, noting how it went on, and replace. No soldering, you may just have to cut the wire to the right length, if you are really fussy.

guinnessman2001

Don't want to be pedantic but if the voltage increases and the load remains constant then the current will increase as well.

Assume a 12V system into a load of 12ohm then the current will be 1A.
Increase the voltage to 15V into the same 12ohm load and the current increases to 1.25A.

It's immaterial anyway, as any small increase in current is unlikely to damage any car wiring. Excluding of course the direct replacement of 60W bulbs with 100W items, then the current will increase from around 5A to over 8A and could cause overheating problems.

joz8968

iTrader: (13)

Yep, if the resistance (ohms) of the electrical circuit hasn't increased in any way after fitting higher voltage bulbs, then it HAS to be a greater current (amps) draw, to achieve said voltage.

After all:-

V (volts) = I (current) x R (resistance)

Apologies for the condascending physics lesson lol