I knew it from the start that it was the cable connecting the battery compartment to the light head. I twisted it around a little and got some mixed results but in the end it died completely. Back in the office turned on the lamp, grabbed my tools and got to some serious tearing apart. The light head wasn't anything new but it was a first timer for the battery compartment. I was surprised to find in there a fuse that was actually blown out from my screwing around back on the mountain.
|A fuse can be seen at the left end of the red wire|
Didn't bother to dig into the problem that much and just took off the old cable. Unfortunately it's not an easy kind of cable to find so I had to improvise and use an electrical outlet cord. I could have found thinner alternatives but I wanted a decent cross section for low voltage drops and increased stiffness. It's left to see how well the new cable will hold up with low temperates and mountaineering abuse.
This is what came of it:
|Final "masterpiece" after cable replacement|