Originally Posted by thomask
Update: New c cells added to mag lite , no light.
Last week I took mag lite to battery store and they tried with no success. Any thoughts on repair. Bulb is ok, batteries new, no light?
It's a simple series circuit: batt + through light through switch and into batt - terminal, plus there are all the connections between these three components.
The problem is you can't get inside the flashlight when assembled to check the voltages at each point or current flow.
Using unbent paper clips you can make a circuit with your batteries and lamp; if it works then you have narrowed down the possibilities somewhat. It's easy but it is also unlikely to be the problem.
If you check the switch inside the flashlight you should use a test light that passes an amp or so through the switch. This means the bulb inside the test light is incandescent and not an LED. Most ohmmeters only pass a few mA through the device under test.
I guess you could wrap the next batteries in wax paper.
On pulling the batteries out I guess you could drill a pilot hole for a lag screw, run the screw through one battery at a time and try to extract it.
To hold the case you might be able to use one of these Chinese finger trap things that are used on service entrance cables. They look like a mesh and the harder you pull the tighter they clamp down on a section of cable but the clamping force is distributed.