You just had that explained T-rev.

The cruise control uses the voltage spike from the current draw of the brake
lights as a release mechanism - the LEDs don't pull enough current, so the
release mechanism is not triggered.

I wanted brighter rear running lights so I installed brighter incandescent
bulbs.  Happy now...

Jake

On Sun, Jul 4, 2010 at 3:03 PM, T-rev Reynolds <gneiss9@gmail.com> wrote:

> Subject: Re: Switch to LED lighting
>
> "Guessing LED 'fools' the Cruise Control that brakes have not been
> applied yet."
>
> and,
>
> "If a particular cruise control setup detects the current in the
> stop-light line to tell that the brakes have been applied, the lesser
> current drawn by equivalent LEDs might not trigger the cruise control
> to drop out when the brakes are applied."
>
> That wouldn't explain the fact that whoever had originally ran into
> this Cruise Control problem, not getting the vehicle (with brakes not
> applied) to set the speed.
>
> So that brings us back to the original question as to How can LED
> lights screw up the CC from working?  At first I was thinking a
> frequency given off from the lights to the CC unit but that seems
> silly.  I am still baffled as to how the cruise control works or
> doesn't work.  My seems tempermental on the best of
> days!  ...Anyways, I doubt that there was actually a connection to
> the CC problem and installing LED bulbs in your tail-lights/signal-
> lights!?!
>
>
> Trevor Reynolds
> Airdrie, AB, Canada,
> '91 GL 2Wheel drive, AT, Westy "SEN".
> http://westfalia-91restore.blogspot.com/
>

--
Jake

1984 Vanagon GL 1.9 WBX 'The Grey Van'
1986 Westy Weekender/2.5 SOHC Suby 'Dixie'

Crescent Beach, BC

www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27