![]() Now move down the set an even number of lights and test the next pair of lights. Test the second bulb, and the other neon bulb lights. Test the first bulb, and one neon bulb lights. ![]() To troubleshoot an alternating-series string, you must work in pairs. You know you have a bad bulb if the probe lights when you plug it into one side and nothing lights when you plug it into the other side. Back up, just as if the other neon bulb had lit. When you reach this point, neither neon lamp will light. ![]() At some point, you will reach the dead spot between two or more bad bulbs. To troubleshoot a defective set with many bad bulbs, use the same process as above. You know you have the bad bulb when inserting the probe tip into one side of the bulb lights one neon bulb and placing the tip in the other side lights the other neon bulb.įigure 2 Series-string light sets come in two flavors: a continuous-series string (a) and alternating-series string (b). This process should allow you to find a bad bulb in a set of 50 in only seven steps. If the other neon bulb lights, you must move back halfway to the last bulb you tested and try again.
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