| To do simple checks like this you do need some tools. A test light, a meter, or a voltage detector might be the best place to start with. I came across the niftiest gadget for trouble shooting, a voltage detector. They work through the insulation of wires. There are several brands. I have a GB Instruments GVD-505A, less than $15 at Home Depot. Touch it to a hot wire, and the end glows red. Find the doodad that lights it on one side, and not the other, and you have the culprit. You do not have to open up housings and expose electrical contacts. You are looking at where your hand is, not where the meter is. Most people are capable of doing repairs and will get it going and not get hurt if they use a little sense. The voltage detector makes it even easier.
I love my voltage detector for jobs like that. You can even check to see if you have power coming into the box without taking the cover off. If the wires are poked into holes in the back of the switch, that could be the problem. One of them may not be making contact. With the power off, poke something small in the adjacent hole, pull the wire out, andfasten it to the screw. The switch could be bad too. |