| 摘要 |
A testing device for determining, in an automobile electrical system, the integrity and continuity of the power input circuitry to a mobile telephone installation, comprises a pair of body sections that are joined to form a hollow interior region. Electrical contact pins are mounted in bores through an interior wall integral with one of the body sections. The contact pins are arranged to contact terminals, connected to the battery, ignition, and ground circuits of the automobile electrical system, at the junction between the electrical system and the telephone installation. The battery and ignition pins are connected to the input node of a red and a yellow LED, respectively. The output nodes of the LEDs are spliced together and connected to the ground pin. The LEDs are press-fit into an opening through a grommet. The grommet is press-fit and sealed onto the open end of one of the body sections. One of the body sections is adapted to mate with a standard electrical connector at the electrical system side of the junction. The red LED will be illuminated when the ground and battery circuits are properly functioning, while the yellow LED will be illuminated when the ground and ignition circuits are functioning. Neither LED will be illuminated when the ground circuit is faulty. In another embodiment, a fourth pin is mounted in the testing device, corresponding to a terminal at the junction connected to the horn circuit of the automobile. The horn pin is connected, via a diode, to the ground pin of the testing device. The diode is biased to prevent current from flowing from the ground pin to the horn pin.
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