[T3] Lights

[Jim Adney]

On 4 Nov 2017 at 17:21, Dave Hall wrote:

> Thanks, Jim. I wondered how the bulb failure system worked. Further research is indicated.
> Dave
> 
> -----Original Message-----
> From: "Jim Adney" <jadney at vwtype3.org>
> Sent: 04/11/2017 15:15
> To: "type3 at vwtype3.org" <type3 at vwtype3.org>
> Subject: Re: [T3] Lights
> 
> On 4 Nov 2017 at 1:04, Dave Hall wrote:
> 
> > I see that there are special flasher units for LED turn signal lamps -
> > presumably as the old relay no longer senses the larger load that was
> > provided by the filament lamps. The alternative seems to be adding a ballast
> > resistor to mimic the filaments.  Anyone confirm that? 
> 
> There are 2 aspects to this:
> 
> A resistor would give the load that an operating bulb would draw and make 
> an old fashioned (the kind with a thermal heater) flasher run at the proper 
> speed.
> 
> But our flashers, at least the 12 V ones, have another feature that senses 
> that a bulb has burned out and flashes faster then. This is because a 
> tungsten filament draws a LOT more current when it's first turned on and is 
> cold. The initial currrent is 4x-8x as much as the normal operating current. 
> Our flashers sense this overcurrent and use that to trigger the normal flash 
> rate. A resistor won't do this.
> 
> -- 
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
> 
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-- 
*******************************
Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
*******************************