I don’t think I’ve ever had a flashlight that didn’t develop this problem eventually. If the lighter socket stops working, the most likely culprit is a dead fuse that can easily be replaced. I wish flashlight batteries came with little connectors rather than the point contact method they now use, so I wouldn’t have to battle this problem with my flashlights. Even if you don’t smoke in your car, you probably use the cigarette lighterwhich, in newer vehicles, often doesn’t even come with the button that actually heats up to light a cigaretteto plug in things like your phone charger. You don’t want any exposed metal on that side of the connector. Some caution is needed in choosing the style of connectors b/c the one connected under the dash will be hot at all times. Then you’d always have a good connection available for charging your phone using the cig lighter’s fused circuit. Cut off the adapter in other words, and replace with the matching connector. If I had that problem I’d find the wires going to the cigarette lighter under the dash and splice into them with a connector pigtail, and put the other sex of that connector onto your usb charger wires. If you buy another one of those gadgets, the same thing will happen. Here’s my take: You won’t be able to fix this problem long-term. 3.1A Car Charger 12v 24v Fast Charger Rotation Dual USB Port 2 Way Car Charger DC 12V/24V Outlet Cigarette Lighter Socket LED Digital Car Phone Charger For. Probably an aluminum alloy, and the resistive oxide that forms is aluminum oxide, which looks similar to aluminum metal and is why you can’t clearly see it. If you’ve ever tried to solder to those kinds of connections, you know it doesn’t take solder well, so the metal must be some kind of alloy. I think what happens is the current flow when the flashlight is on is causing some kind of electrochemical plating of those metal part, and an oxide is forming which has a high resistance. When I look at those I see no corrosion or dirt or anything unusual. So the problem is at the connection between the batteries and the flashlight spring/clips. It is basically a cigar lighter plug that turns into a USB micro plug. The batteries are still ok b/c if I take them out, reposition, and put them back in again the flashlight works again. Is it okay to keep a USB charger plugged into the cigar lighter Ask Question Asked 11 years, 8 months ago Modified 5 years, 9 months ago Viewed 61k times 6 I have a USB micro charging adapter for my smartphone for my car. If I shake the flashlight, bingo, but it soon fails again. they work ok for a while, then become intermittent. This sounds like the same problem I have with flashlight batteries not making a good connection inside the flashlight.
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