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

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.


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

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