On Thursday, October 5, 2017 at 12:57:07 AM UTC-4, Xeno wrote:
> On 5/10/2017 4:24 AM, m6onz5a wrote:
> > On Friday, September 29, 2017 at 10:18:05 AM UTC-4, Kowshik wrote:
> >> I have Nissan Sentra GXE 1999. recently my headlights are not properly
> >> working. whenever i light up normal light it is quite dim. but my high beam
> >> works well.It has seperate bulbs for high beam and normal beam. how can i
> >> solve this Please help
> >>
> >> --
> >> for full context, visit http://www.motorsforum.com/tech/head-light-120268-.htm
> >
> > did you just recently change the bulb? You may have accidentally touched the bulb glass with your fingertips. Wear rubber gloves and remove the bulb and clean it with rubbing alcohol. It should be fine.
> >
> The oil from fingers will not directly harm the filament. What oil on
> the bulb glass does is change the heat characteristics of the bulb so
> that stresses are creates as the bulb heats up. These stresses will
> crack the glass and, once that happens, the filament is *history*,
> usually in less than a second.
>
> For a filament to be less bright than it should, you need to be looking
> for undesirable circuit resistance which will cut down the current
> passing though the filament. This resistance can be isolated by carrying
> out voltage drop tests on the headlight circuits. The most common places
> for increased resistance in light circuits is at the earth return.
> Corrosion is the usual suspect.
>
> http://www.aa1car.com/library/voltage_drop_testing.htm
>
> --
>
> Xeno

I sell auto parts. I've seen this multiple times when people touch the glass with their bare hands.