Re: [DML] Cruise control and LEDs (was NO JOY!)

[Ryan Wright <ryanpwright@xxxxxxxxx>]

Wow, good info Marty. I will have to add this to my documentation so
others don't run into the same problem in the future.

Thank you!

-Ryan

On 6/8/05, Marty Galbreath <marty@xxxxxxxxxxxxxxxxx> wrote:
> Well, I have cruise control at long last in my D. After going
> through 2 Audiovox CCS-100s, I gave up and ordered an electric unit
> from Dakota Digital. ($250 OUCH!)
> 
> Basically, the two systems are very much alike, the Dakota system is
> USA made and seems a little better quality. And has a speedo encoder
> instead of the magnets and pickup unit. But it did come with one
> important item that the Audiovox didn't have - an ADDENDUM which
> warns that it WILL NOT WORK WITH LED BRAKELIGHTS!!! Of course "I"
> have led brakelights!!! Eureka!
> 
> The purple cruise control system wire that ties to the switched
> brakelight signal must see GROUND in the off position to work
> properly, LEDS don't allow enough current to flow to properly ground
> the wire, since they are DIODES. Duh!  Using LED brakelights
> requires inserting a relay to switch between +12V and GROUND for the
> purple wire. This is really simple to do...(if you know you need to
> do it in the first place). Simply wire the relay coil to ground and
> the brakelight signal, hook the purple wire to the common,
> unswitched +12V to the Normally open post, Ground also to the
> normally closed post. Now when you press the brake, the relay will
> go from ground to +12V on the purple wire of the cruise control.
> 
> This adventure has cost me a lot of cash, but I hope my lesson will
> help all you folks who have LEDS and try to install cruise.
> 
> Cruising to Houston tomorrow...
> 
> Marty Galbreath
> #03765
> 
> 
> 
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