A hum tracer tester works by detecting the electromagnetic vibrations generated by household electrical current.
Christmas light bulb tester instructions.
Place the electric cord next to the d battery.
If you don t have any replacement bulbs you can leave the foil in until you do.
Test 100 incandescent light tester instructions plug the light tester into a standard 120 volt outlet and flip up the on off power switch.
If the same neon bulb lights then the problem is in the second half of the set.
Over at wikihow i found this tutorial on how to make a mini christmas light bulb tester.
You start at the plug and follow the wires of the christmas lights into and out of each socket.
Learn how to use your light keeper light tester to solve problematic lights.
One of 4 things should happen.
If the light doesn t light then the bulb was bad.
The christmas light tester comes with 2 lr44 watch batteries.
Instructions on use and care of the christmas light tester are included.
There s a way to test and fix the entire string of miniature lights without testing each bulb individually.
If they don t put the bulb back in and move on to the next one.
One of the neon bulbs should light.
Carefully splice the cord down the middle so you have two separate pieces that are still attached to the plug.
Instead of going out and buying one of those fancy light testers that don t seem to work like they should try this to test your mini lights and see if they work and need to be replaced.
Insert the tip of the tester s probe into the wire hole in the base of the first bulb.
Remove a bulb from an unlit section plug the empty socket into the connector plug the string into an electric outlet then squeeze the trigger until the lights turn on.
An led light on the unit stays lit when it detects a hum.
If the lights come on you know that s the bad bulb.
Lights should kick.
Now plug the christmas light bulb into the tester and see if it lights.
Adjust the spacing between the two prongs to be the width of one of the light sockets in the christmas lights.
Move halfway down the set and insert the probe again.
Pull out one bulb at a time and stick a piece of folded up foil into the bulb socket.
To use the light tester remove the battery cover and insert.