5 Prong To 4 Prong Trailer Adapter. Affected three-prong wall plug adapters are white, with no letters in the inside slot where it attaches to an Apple power adapter. I changed a four prong to a three prong and now it does not heat up.
Two additional leads are accessable, Blue for connection to electric brakes and Black for aux power. With four prongs spaced evenly apart, it will create a boxy looking appearance as the prongs function as "separate corners" of a squarish outline. A box-like appearance created by even prongs placement.
The three prongs are for the two "hot" leads and the third is for the equipment grounding conductor.
You don't know if the wiring is bad or you have bad bulbs.
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