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

["Marty Galbreath" <marty@xxxxxxxxxxxxxx>]

No, I suppose you could use a resistor, as I did with my turn signal 
LEDS, but it seems to negate a lot of the current savings of the 
leds in the first place. I am sending you my relay scheme off list, 
as I did for others who were interested.

Marty Galbreath
#3765


 
--- In dmcnews@xxxxxxxxxxxxxxx, "Elvis Nocita" <elvisnocita@xxxx> 
wrote:
> 
> ok this post is a week old, but I just returned from my vacations.
> 
> Marty - did you try to use a resistor instead of the relay ?
> I mean a let's say 470 Ohm to 1k resistor in parallel to the 
diodes ?
> 
> Just a suggestion because it is easier to install and much smaller.
> 
> Elvis
> 
> 
> 
> 
> 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






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