Dunno bout electrical issues, but it sure is a poor design with the greatest stress being at the point where the plastic is thinnest - under the o-ring. 

Karl Wolz
Sent from my electronic umbilicus

On Oct 19, 2011, at 11:08 PM, Jeff Schwaia <vw.doka@GMAIL.COM> wrote:

> Not sure what the problem is, but the aftermarket ones have issues.  Van
> Café has had real issues with them.
> 
> Cheers, 
> 
> Jeff
> 
> 
> -----Original Message-----
> From: David Beierl [mailto:dbeierl@gmail.com] On Behalf Of David Beierl
> Sent: Wednesday, October 19, 2011 10:37 PM
> To: Jeff Schwaia
> Cc: vanagon@GERRY.VANAGON.COM
> Subject: Re: Sometimes it does not ...
> 
> At 11:22 PM 10/19/2011, Jeff Schwaia wrote:
>> The cheapo coolant level sensors are known to be unreliable right out of
> the
>> box.  I would try another to make sure.  A German one if possible.
> 
> Jeff, what's to go wrong with them?  They're just a pair of stainless 
> steel pins half an inch apart...
> 
> Yours,
> David