The connectors are designed for 55 Watts. Your use of non-road legal light bulbs is simply too much wattage for what the connectors (and wiring) are able to handle. 

Heck, I used 55 watt fog lights, and they were too much for the 29 year old wiring/connectors/fusebox  in my 86. 

> On Jan 26, 2015, at 12:15 PM, Pat Patterson <SESRating@AOL.COM> wrote:
> 
> My 80/100 hi/low bulbs have been cooking the plastic connectors that  plug
> on the back of the bulbs.  Is there a source for ceramic  connectors?  I
> have an 86 and it works OK with 4 100 watt high beams and  two 80 watt low
> beams, until it destroys the plastic connectors.
> 
> Pat
> 86 AW Subi 2.5
> 82 Westy
> in SC near Charlotte NC