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Re: LED lights

To: Paul Hunt <>
Subject: Re: LED lights
From: Andrew Lundgren <>
Date: Tue, 03 Oct 2006 11:52:44 -0600
There are some controllers that have more functionality. 

When you connect a trailer to the tow wire harness on my '99 Suburban it 
controls the trailer lights with no change in flash rate.  So there are 
controllers that will drive more than 2 blinkers at one time, the 
original application may very though.

Paul Hunt wrote:
> Well, as far as I'm aware they all 'clink, clink'.  But the modern 
> electronic OE units wouldn't be any good either.  Both old and new 
> types are designed to work with two and two only bulbs (or equivalent 
> loads), and both are designed to give an audible and visual warning of 
> bulb failure.  The older units stop flashing and leave the remaining 
> bulb working as we know, the modern units flash at double speed.  With 
> the load of just a pair of LEDs they would be flickering away like 
> billy-oh.  The only flasher units that *might* work with a low load 
> like LEDs are those after-market units which don't have a failure 
> warning mode, and which are a serious safety hazard as a consequence.  
> I certainly wouldn't want to be sitting in a lane waiting to turn 
> across traffic with the flasher unit going 'clink clink' and the 
> tell-tale flashing away as it should, not knowing that nothing was 
> flashing at the back (or front).  Without an equivalent load you would 
> need a third way (designed by Blair, perhaps?) of flashing a pair of 
> very low current LEDs whilst still giving an indication of bulb failure.

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