ELECTRICAL TROUBLESHOOTING TOOLS
GI-14prose procedureTEST LIGHT
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 checking for short circuits.
CAUTION
Using a bulb over 3.4W when checking the control module may damage the control module.
JUMPER WIRE
A jumper wire is used to create a temporary circuit. Connect the jumper wire between the terminals of a circuit to bypass a switch.
CAUTION
Do not connect a jumper wire from the power source line to a body ground. This may cause burning or other damage to wiring harnesses or electronic components.
VOLTMETER
The DC voltmeter is used to measure circuit voltage. A voltmeter 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.
OHMMETER
The ohmmeter is used to measure the resistance between two points in a circuit, and to check for continuity and short circuits.
CAUTION
Do not connect the ohmmeter to any circuit to which voltage is applied. This will damage the ohmmeter.