Patent ID: 8344737

Claim:
A circuit tester device for testing continuity and polarity of vehicle relay circuits coupled to a relay socket, the circuit tester device comprising: a housing; a plug extending from the housing, the plug including a plurality of pins each pin being adapted to electrically connect to a respective one of a plurality of receptacle terminals of a relay socket; a battery lead carried by the housing and adapted to connect to a battery terminal; a ground lead carried by the housing and adapted to connect to a ground; and a circuitry mounted within the housing and including at least three circuits connected between the battery lead and the ground lead, each of the at least three circuits including in series a first resistor, a first status indicator, a first diode, a second diode, a second status indicator and a second resistor, each of the at least three circuits further including a test terminal that is coupled between the first and second diodes and further connected to a respective one of the at least three of the pins, wherein the circuitry further includes at least one load circuit tapped into one of the at least three circuits between the first and second diodes, the at least one load circuit including in series a test switch and a load terminal connected to a respective one of the other pins.