If you read a little further into the Wikipedia entry you see:
  " It can be applied to the actual contact as well, because the
contact pressure is sufficient to penetrate the grease. Doing so on
such high pressure contact surfaces has the advantage of sealing the
contact area against corrosion."

Having said that, a little further it says that dielectric grease is
not advised for connectors where the contact pressure is very low.

Larry A.
  keeping the contact pressure high

On Sat, Aug 25, 2012 at 12:12 PM, Rob <vwrobb@gmail.com> wrote:
> Just so there is no confusion, dielectric grease is an INSULATOR. It
> belongs on the rubber boot of the cable NOT on the metal connector part.
> It keeps crap away from the electrical connection.
> If you do put in on the connector part a good tight fit will push the
> grease away and the electrical connection will happen at that part in
> spite of the insulation you put on it.
>
> Rob
> vwrobb@gmail.com
>
>
>
> http://en.wikipedia.org/wiki/Silicone_grease
>
>>>Dielectric grease is electrically insulating and does not break
> down when high voltage is applied. It is often applied to electrical
> connectors, particularly those containing rubber gaskets, as a means
> of lubricating and sealing rubber portions of the connector without
> arcing.<<
>
> At  8/25/2012 02:54 AM, Frank Condelli wrote:
>>
>>         Dielectric grease, ever heard about it ?  Well, obviously
>> the person who INSTALLED those cables in the dizzy cap did not
>> !  Using Dielectric grease on both ends of the plug wires make them
>> a breeze to remove later on down the road.  Now, you will just have
>> to twist and turn and pull and hope nothing gets wrecked in the
>> process.  Maybe time for new dizzy cap and wires !