With the light/battery connected and working, try moving the wires directly connected to the plug(s) ( back and forth - hold the plug still and do one at a time ) . While moving the wires if you see the light go out you have a broken wire within the plug/wire connection. When the wire moves the wrong way the light goes out. This is usually caused by someone disconnecting the plugs by pulling on the wires rather than the plugs themselves. Cold weather makes wires stiff and can exacerbate the problem.
If the problem is on the light head side of the plug...good news the light head has a life time warranty. If it's on the battery side and the battery is out of warranty you might have to replace the plug.
Thanks for your feedback. I just wanted to make sure I was not 100% retarded (only slightly).
I think its the connector and not the wires just beyond them. I tried to wiggle the wires and nothing. When I turn the connection...keeping them together...the light goes off. Both items were bought new a couple month ago and I have never pulled them apart by the cord.
I hope they are quick at replacing stuff under warranty