[Shotimes] Re: upgrading bulbs in headlights

[cmichaelo@optonline.net]

The way the "lamp out" sensing works is that a solid state module senses the voltage drop, Vlo, across an inline resistor (inline with the the headlights.)

Vlo is normally around ~0.5V. (So there's part of our "reduced" brightness problem...:)  )

When one lightbulb burns out, Vlo decreases to around ~0.25V, and it is this decrease in Vlo that is sensed by the solid state circuit and turns the LAMP OUT indicator ON.

Now, when installing the wiring harness and using the old headlight wires/sockets to control the relay in the new wiring harness, there sure is going to be a significant drop in Vlo since the relay only requires a few Watts to be activated.  So it would seem that the LAMP OUT indicator could come ON with a wiring harness.

Though, it's weird that some people do see the LAMP OUT ON and some don't. Any explanations?

I think though that it should be easy to fix by inserting a properly size resistor in serious with the inline resistor.

Michael
94MTX,green,BOS+,Koni/Intrax,Baer,Corbeau
SHO items for sale: http://hometown.aol.com/cmichaelo/for_sale.html

----- Original Message -----
From: Carl Prochilo <gr8sho@prochilo.myserver.org>
Date: Thursday, November 11, 2004 6:42 pm
Subject: Re: [Shotimes] Re: upgrading bulbs in headlights

> Funny post.  Sounds like an optical illusion.  :O.
> 
> I would hope that 100/80W bulbs throw more light.  You have an 
> aftermarketharness I assume, and then you have the LAMP OUT 
> indicator on?
> -- 
> Cheers,
> Carl Prochilo
> 92 Ultra Red Crimson
> 
> On Thu, November 11, 2004 9:43 am, M Khan said:
> >> Hopefully the 893 size
> >> will be offered too.
> >
> >
> > I ran 9007ST Silverstars and 880ST (comparable to
> > 893s, same harness) bulbs in my stock 95 headlamps and
> > foglamps.  I have to say though, I was not impressed
> > with either.  (The headlamp lenses are clear, but the
> > foglights are quite cloudy).
> >
> > I have since changed to Eurolitez Xenon 9007hxc's and
> > H3lxc's, with a nice set of blazer fog lights which
> > fit right up with little modification.  I am very
> > happy with this set up.
> >
> > I don't recommend the silverstars, unless they are
> > used in the jewel type headlamps, other than that, I
> > don't think they are worth the $$$.  They are
> > especially bad in the rain.
> >
> > Mike
> > 95 MTX
> >
> > www.geocities.com/sho_off_1993
> >
> >
> >
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