![Why does my tester not indicate voltage when a light switch is on? - Home Improvement Stack Exchange Why does my tester not indicate voltage when a light switch is on? - Home Improvement Stack Exchange](https://i.stack.imgur.com/XIEsi.png)
Why does my tester not indicate voltage when a light switch is on? - Home Improvement Stack Exchange
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Electrical Wire Circuit Tester, 6V-24V Car Electrical Circuit Continuity Tester with Indicator Light Auto Electrical Test Light for Low Voltage Systems, Fuse, Switch, Wires Diagnostic tools : Amazon.co.uk
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