Abstract: A device for finding an inoperative bulb in a series string of lights, such as a string of Christmas tree lights having a plug, a pair of electrically conductive leads connected to the plug and having their ends terminating within a casing of the device, a polarity switch having first and second terminals each connected to a lead of the pair of leads connected to the plug, a probe for insertion into and contact with the wire of the socket of the light string, and an indicator circuit for determining whether an electric current is passing through the series string thus indicating the presence or lack of an inoperative bulb. The indicator circuit is located between the polarity switch and the probe and a protective sheath is provided to prevent any part of the probe from being exposed to avoid a user from being shocked, the protective sheath being continuously biased to cover the probe.

Abstract: A method of assembling an electrical pin connector utilizing a molded carrier element to support and hermetically seal a number of preoriented and spacially disposed electrical pin connectors prior to inserting the carrier into a correspondingly shaped aperture of a shell housing and bonding the carrier to the shell housing to provide a hermetic seal thereto.

Abstract: An integral lead frame for a thick film substrate mounted in a housing has three portions. A first portion in the interior of the housing contacts the thick film substance with stress relieved terminals having an arcuate hoop and reduced width. A second portion includes vertical steps for changing the plane of the lead frame. The third portion includes a connector blade with a thickness greater than the terminal thickness.