This method is for plain light bulb strings. Here's some good hints to make fault finding easier:
- If no light bulb glow check power is at power point and fuses in the plug are not blown.
- If lights randomly flash, press each light bulb into its base because a bulb could be loose.
- Check if any bulbs are broken before starting fault finding.
- When you remove a light bulb, check the leads are aligned correctly, the bulb is OK with a DMM on resistance function, and the contacts in the light's base are not corroded.
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| LHS bulb has misaligned (red) wire; RHS has good alignment |
Method 2 uses a special device called a 'non contact voltage detector' (NCVD) which picks up the AC electric field (50 or 60 Hz) off an energised wire. It needs some practice to use this device. If you buy one, the KLEIN NCVT-2 device (about $20) is recommended because its minimum voltage pick up is 50VAC.
Look at these videos to gauge its effectiveness and how to use it:
1 http://www.youtube.com/watch?v=3okLMo7a6x0
2 http://www.youtube.com/watch?v=ybePn7Sy4Y4
Note this method does not work on DC lights or LEDs.
NEXT >> Fault finding method for any form of light bulbs or LEDs
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