November 30th, 2015 
Joe 
This 2005 Toyota Matrix came to me with an inoperative headlamp. It was not just the bulb, the socket it plugs into melted as well. I noticed that the socket had been replaced before and I wondered if perhaps that the circuit had a bad ground to cause this. I measured voltage drop for the circuit and it was within a normal range. Well apparently if you do not replace the head light socket with a high temperature rated plug it will melt like the one you see here pictured on the right. Especially with daytime running lights that are left on continuously.
New high temp plug on left. Burnt out low temp socket on right
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