Electrical Troubleshooting Tools; Test Light; Jumper Wire; Voltmeter - Mazda MX-5 1990 Workshop Manual

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ELECTRICAL TROUBLESHOOTING TOOLS

The test light, as shown in the figure, uses a 12V bulb. The

two lead wires should be connected to probes_

The test light is used for simple voltage checks and for check-

ing for short circuits.

• When checking a control unit, never use a bulb over

The jumper wire is used for testing by shorting across switch

terminals and ground connections.

• Do not connect a jumper wire from the power source

line to a body ground; this may cause burning or

other damage to harnesses or electronic com-

The DC voltmeter is used to measure circuit voltage. A volt-

meter with a range of 15V or more is used by connecting the

positive (+) probe (red lead wire) to the point where voltage

is to be measured and the negative (-) probe (black lead

wire) to a body ground.

Diagnosis Connector

Insert the probe into the service hole when connecting a jum-

per wire to the diagnosis connector.

• Do not insert the jumper wire probe into the diag-

nosis connector terminal, which may damage the

The ohmmeter is used to measure the resistance between two

points in a circuit, and to check for continuity and short circuits.

• Do not attempt to connect the ohmmeter to any cir-

cuit to which voltage is applied; this may burn or

otherwise damage the ohmmeter.

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