AUTOMOTIVE ELECTRICAL CIRCUITS AND WIRING

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WIRING DIAGRAMS Figure 2-87.- Metal tag wire identification. Wiring diagrams (fig. 2-88) are drawings that show the relationship of the electrical components and wires in a circuit. They seldom show the routing of the wires within the electrical system of the vehicle. Often you will find ELECTRICAL SYMBOLS used in wiring diagrams to simulate individual components. Figure 2-89 shows some of the symbols you may encounter when tracing individual circuits in a wiring diagram. WIRE TERMINAL ENDS Wire terminals are divided into two major classes- the solder type and the solderless type, which is also known as the pressure or crimp type. The solder type has a cup in which the wire is held by solder permanently. The solderless type is connected to the wire by special tools. These tools deform the barrel of the terminal and exert pressure on the wire to form a strong mechanical bond and electrical connection. Solderless type terminals are gradually replacing solder type terminals in military equipment. Figure 2-88.- Wiring diagram of a passenger vehicle showing standard equipment and color code for wires. AUTOMOTIVE ELECTRICAL CIRCUITS AND WIRING 100/ 101
Figure 2-89.- Wiring diagram symbols. Wire passing through holes in the metal members of the frame or body should be protected by rubber grommets. If rubber grommets are not available, use a piece of rubber hose the size of the hole to protect the wiring from chafing or cutting on sharp edges. WIRE SUPPORT AND PROTECTION Wire in the electrical system should be supported by clamps or fastened by wire ties at various points about the vehicle. When installing new wiring, be sure to keep it away from any heat-producing component that would scorch or bum the insulation. AUTOMOTIVE ELECTRICAL CIRCUITS AND WIRING 101/ 101
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AUTOMOTIVE ELECTRICAL CIRCUITS AND
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AUTOMOTIVE ELECTRICAL CIRCUITS AND
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It must help the charging system pr
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BATTERY CASE, COYER, AND CAPS. The
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BATTERY CAPACITY The capacity of a
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smaller charge is needed. As the ba
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the water slowly, stirring gently b
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the terminals just enough to secure
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Figure 2-6.- Battery leakage test.
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To perform a battery drain test, se
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must be used to convert from altern
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charge, the line voltage will incre
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Figure 2-14.- Schematic wiring diag
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short is present, the steel strip w
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Figure 2-20.- Testing an armature f
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The fingers on one of the claw-shap
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A cross-sectional view of a typical
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The electronic voltage regulators u
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If the ohmmeter reading is low or t
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After completing the required test
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CAUTION Follow the manufacturer's d
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armature and the field; the attract
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gears engage and when the engine ki
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voltage from the battery is often t
Page 49 and 50: eduction drive head may rotate as m
Page 51 and 52: Once the starter is checked and rep
Page 53 and 54: The ignition circuit is actually ma
Page 55 and 56: Figure 2-43.- Ignition switch and p
Page 57 and 58: DISTRIBUTOR CAP.- The distributor c
Page 59 and 60: SPARK PLUG WIRES The spark plug wir
Page 61 and 62: The components of an electronic ign
Page 63 and 64: As speed increases, centrifugal for
Page 65 and 66: Spark Plugs and Spark Plug Wires Ba
Page 67 and 68: Figure 2-50.- Ash fouled. When a sp
Page 69 and 70: A common problem arises when a CARB
Page 71 and 72: ELECTRONIC IGNITION DISTRIBUTOR SER
Page 73 and 74: After the initial ignition timing,
Page 75 and 76: Figure 2-56.-( A) Single-contact bu
Page 77 and 78: Figure 2-60.- Blackout light/ headl
Page 79 and 80: To ensure that the headlights are p
Page 81 and 82: Figure 2-65.- Blackout driving ligh
Page 83 and 84: The turn signal flasher unit (fig.
Page 85 and 86: EMERGENCY LIGHT SYSTEM The emergenc
Page 87 and 88: operation, the voltage indicated on
Page 89 and 90: The THERMOSTATIC FUEL GAUGE, SELF-R
Page 91 and 92: A pressure gauge is used widely in
Page 93 and 94: Figure 2-82.- Types of sending unit
Page 95 and 96: Electronic Speedometers and Tachome
Page 97 and 98: AUTOMOTIVE WIRING Learning Objectiv
Page 99: Figure 2-86.- A typical wiring harn
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AUTOMOTIVE ELECTRICAL CIRCUITS AND WIRING

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