just a guess but do not take this as gospel. i'm assuming this is a towable trailer.
4 wires could be:
heavy battery cable for positive terminal
heavy battery cable for negative terminal
break away brake power cable (positive terminal)
power jack (positive terminal) - this is the one I am least certain of
this is just a guess and in no way would I do anything without verifying. once you get it figured out either put some labels on each wire and/or take a picture.
perhaps some others will chime in also
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2015 cardinal model 3825fl
2015 dodge ram 3500 dually
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