Re: [DML] LED Rear Light Replacment...

["Marty Galbreath" <marty@xxxxxxxxxxxxxx>]

That somebody was me. The cruise control systems I tried (Audiovox 
and Dakota Digital) required a ground to be present through the wire 
that connects to the brake light switch when the switch was not 
active. Regular bulbs will present this ground to the wire through 
the filament of the bulb. LEDs have such a high impedance that there 
is virtually no ground present on the wire anymore.

Adding an LED 3rd light to a system with conventional bulbs still in 
the brakelight sockets will work fine, since the regular bulbs are 
conducting to ground. 

The solution for changing the regular brake light bulbs to LEDS is 
to install a relay in the brake light wire which will toggle between 
a known ground reference when off and the +12v of the brakelight 
circuit when the pedel is pressed. I am in the process of 
documenting how I did this and will post the scheme soon.

Marty Galbreath
#3765


--- In dmcnews@xxxxxxxxxxxxxxx, DMCVIN6683 <dmcvin6683@xxxx> wrote:
> I dont know exactly. Somebody on this list had a problem with the 
LED 
> replacement bulbs making the cruise not work. I have cruise 
installed 
> on my delorean and have a 3rd LED brake light with no problems.
> 
> Mark V
> 
> 
> On Sep 16, 2005, at 3:57 PM, Greg Zapf wrote:
> 
> > On 9/15/05, DMCVIN6683 <dmcvin6683@xxxx> wrote:
> >> If i didnt have cruise control on my car i would probably get a 
set of
> >> the brake lights.
> >
> > I plan on adding a cruise to my car at some point, and I also 
planned
> > to use LEDs for at least a third brake light...  What's the 
conflict
> > between these?
> >
> > Thanks,
> > --Greg
> > #2894




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