I see too many threads about "my light won't come on" where people just do not know the basics of what to do in that type of situation, so here it is in a nutshell:
BASIC FLASHLIGHT TROUBLESHOOTING PROCEDURE:
1 – Check the battery polarity (most often positive towards the head, but not always)
2 - Make sure all parts are screwed in all the way and remove / reinstall your dropin if applicable while inspecting for broken parts.
3 - Try a new non-rechargeable battery (and new bulb if it’s an incandescent)
4 - Clean all contacts: inside the head, spring(s), tube ends and threads. (Rubbing alcohol and a Q-tip work fine or this)
4A - For twisties and lights that have erratic behavior: check if your o-rings are not creating too much friction (too dry or too big) or not enough tension (too small). Big o-rings can prevent contact, small o-rings can make contacts happen when not desired, causing flickers or undesired mode changes.
5 - Remove the tailcap and short the end of the battery with the end of the tube (a trombone works just fine).
5A - If this works: tighten the tailcap retainer ring (note that some are reverse threaded).
5B - If tightening the retainer ring doesn't work dismantle the switch, clean all contacts inside the switch area
5C - If this does not fix the problem, but the light comes on when you short the battery and the tube end, you most likely have a defective switch.
6 - Contact you dealer. If the dealer warranty is over, contact the manufacturer. Some dealers and manufacturers will honor the warranty for longer than stated or will provide replacement parts for a reasonable fee and sometimes even for free.
Don’t just give up on a light or brand just because your light didn’t come on.
As a standard maintenance procedure, you should lubricate your o-rings (see the comprehensive grease and lube thread for more details) and clean your contacts on a regular basis (at the very least once or twice a year up to once a month, depending on your usage.) Once a year, I check that my retainer rings are screwed in properly and I basically never have any problems.
Let me know if I forgot anything and I invite you to share your tips & trick or stories of a light that neede a simple maintenance to get going again :thumbsup:
You're very welcome... and you still haven't seen nothing yet
CPF can point you towards the wallet blackhole of flashlight addiction :devil:
I found that spending less sorta happens after finding out the hard way what works best for you, then you aim at more specific interfaces, emitter colors, etc. The temptation level is still the same, but you look at less options, so end up buying a little less.
It sounds like a good idea to have a section to help with our addiction, but it would be like asking an alcoholic how he keeps of booze: he doesn't, but he finds different bars to get drunk at (in other words, you'd be pointed to different dealers, manufacturers or places to play with your lights.)
To help anyone looking for a problem resolution in this thread:
I exchanged a few PM's with One Missed Call and it would seem there was some grease on his light's tube endings. This can happen when the guys doing the final assembly put too much lube or just have some lube on their hands or whatever - I've done it myself a couple of times. The light works fine so far and I bet it will keep rockin'.
I highly recommend DeoxIT. I work with electronics all day and much of it is repair work. We have tried all types of contact cleaners and DeoxIT works wonders and keeps the contacts looking good for a long time. Grab a bottle and it will last you a long time if all you are doing is cleaning your light contacts once in a while. I just cleaned my Quark 123 contacts with it the other day and they look as good as new now.