OUTLINE — HOW TO USE THIS SECTION / ELECTRICAL TROUBLESHOOTING TOOLS
T-9prose procedureHOW TO USE THIS SECTION
Information regarding removal and installation of electrical equipment is given in SECTION S. Understanding will be easier if this section is used in conjunction with the WIRING DIAGRAMS.
ELECTRICAL TROUBLESHOOTING TOOLS
Test Light
The test light, as shown in the figure, uses a 12V bulb. The two leads should be connected to probes. The test light is used for simple voltage checks and to check for open circuits.
CAUTION
When checking a control unit, never use a bulb over 3.4W.
Jumper Wire
The jumper wire is used for testing by short-circuiting switch terminals and for verifying the condition of ground connections.
CAUTION
Do not connect the jumper wire between a power source line and body ground because this may cause burning or other damage to harnesses or electronic components.
Voltmeter
The DC voltmeter is used for measuring circuit voltage. A voltmeter with a range of 15V or more is used by connecting the positive (+) probe (red lead) to the point where voltage is to be measured and the negative (−) probe (black lead) to the body ground.
Ohmmeter
The ohmmeter is used to measure the resistance between two points in a circuit, and is also used to check for continuity and diagnosis of short circuits.
CAUTION
Do not attempt to connect the ohmmeter to any circuit to which voltage is applied because this may burn or otherwise damage the ohmmeter.