There are many fault finding methods presented on the internet but in these sections I'll show you the best for each particular application. What you NEED from a fault finding method is to be simple, quick, reliable and requiring the lowest technical knowledge and equipment to do.
Method 1: Suits 120V light string fitted with a SHUNT in each bulb (see photo)
If the string doesn't light:
Check power is at power point and fuses in the plug are not blown.
If the string doesn't light:Check power is at power point and fuses in the plug are not blown.
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.
The method is shown on video, http://www.youtube.com/watch?v=WuVtMvMNFE4 and the Lightkeeper Pro (TM) tool is shown below. As shown in video, this tool injects a high voltage spike into the light string when the trigger is (repeatedly) pressed. The spike breaks down the insulation on the shunt inside the failed bulb; it becomes a good short. Then the good lights in the string light up - replace the bad bulb ASAP.
The method is shown on video, http://www.youtube.com/watch?v=WuVtMvMNFE4 and the Lightkeeper Pro (TM) tool is shown below. As shown in video, this tool injects a high voltage spike into the light string when the trigger is (repeatedly) pressed. The spike breaks down the insulation on the shunt inside the failed bulb; it becomes a good short. Then the good lights in the string light up - replace the bad bulb ASAP.
This tool should not be used on LED lights because it will blow them up.
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