nasa779
Newly Enlightened
fixed, tailcap assembly was loose, red loctite FTW
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Don't put the batteries in backwards! If there is just a minor not quite tight problem...you may blow the electronics.
Try the batteries-no tailcap..then short the rear battery to the body. Use a small pliers if you don't have wire.
Some new lights just don't make contact at all the right places...and you have to try loosening and tightening everything a few times.
If you have no luck...but can get at the led- the try putting the voltage from 1 123 battery directly to the led with two wires. Won't hurt here if you get the battery wrong. Not enough voltage to hurt the Led, but it will light dimly if you get pos to pos, and the led is ok. Do not use 2 batteries!! THat will blow the led.