Step 2 locate the two wires on the bottom of the bulb and touch a probe to each wire ensuring that the probes do not touch each other or more than one wire.
Easiest way to test christmas lights.
Testing the connections and wiring in fairy lights 1.
From the string and move it along the cord until it stops beeping at the defective bulb.
Open the fuse case.
Second test the christmas light bulbs with an inexpensive tester available where holiday lights are sold and online.
How to find a bad bulb in christmas lights.
Christmas light testers the most convenient way to test for faulty bulbs in a light string is through the use of a light tester.
Begin at one end of the darkened string of christmas lights and carefully remove the first bulb.
Press down the black button hold the tip about 1 2 in.
Making the connections should cause the led to light up.
Then you attach the lights on a slide piece with clips.
Light testers search for the point in the string where the voltage changes between a good bulb with current flowing and a problem area with minimal current.
Examine the plastic closely on the side of this box and in between the prongs for a cover you can slide or pry open.
Make sure that the cathode and anode are not touching each other during this test which may prevent the current from.
Looks like it will make hanging outdoor lights on the house really easy.
The black and red probes should also not be touching each other during the test.
You can see how to wire a plug and test cables here 3.
Unpack your bulbs and plug them in to test they work before you put them on the tree.
A string of christmas lights typically has one or two tiny fuses in the plastic box attached to the prongs.
When they don t work 2.
Check the fuse and wiring in the plug.
These often get stuck so you may need to use some force.
There s a way to test and fix the entire string of miniature lights without testing each bulb individually.
It s a strip of trim you affix to your house.