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Published byMagdalene Warren Modified over 9 years ago
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1 Automotive Electrical Systems R. Bortignon
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2 Electrical Circuits Contain 4 main parts… 1. Power source battery alternator
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3Load 2. The load in a circuit is the part that does the work load will always have some resistance this resistance can be measured
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4Control 3. The control is what turns the load on or off… opens & closes the circuit may be installed on the ground side or the power side of circuit
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5Path 4. The path are the wires that connect the battery & alternator to the control and load devices in a circuit frame/body of the vehicle is a path for the ground circuit
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6 Circuit Protection to protect the vehicle’s electrical system from excessive current flow, fuses are usedto protect the vehicle’s electrical system from excessive current flow, fuses are used fuses open the circuit if current (amperage) levels exceed a predetermined level
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7 Types of Fuses cartridge fusescartridge fuses blade type fusesblade type fuses mini size standard size maxi size mega fuse ceramic disc fusesceramic disc fuses see info on next slide replace fuses with correct amperage rating!!!
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8 Positive Temperature Coefficient Fuses PTC fuse technology utilizes a polymer-based material to protect electrical circuits from excessive current. During normal operation, numerous carbon paths within the polymer allow the device to conduct electricity. As current through the PTC fuse reaches its rated threshold, the polymer material begins to heat causing the polymer to expand. The resulting expansion breaks the carbon chains to reduce the current through the circuit to a small leakage current. The increased resistance in this resettable fuse works to protect circuitry by limiting potentially damaging current. When the fault (over-current) is removed from the circuit, the PTC fuse will reset itself thereby allowing current to flow through the circuit again.
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9 many older vehicles use glass cartridge fusesmany older vehicles use glass cartridge fuses
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10 Fuse Panel Locations can be located…can be located… under left side of instrument panel in the engine compartment many vehicles have fuse panels in both locations
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11 Fusible Links special wire that breaks & opens a circuit when overloadedspecial wire that breaks & opens a circuit when overloaded insulation bubbles, melts & opens to expose wireinsulation bubbles, melts & opens to expose wire usually connected near the battery & feeds the fuse box(es)usually connected near the battery & feeds the fuse box(es) must be replaced with correct ratingmust be replaced with correct rating not all vehicles use fusible linksnot all vehicles use fusible links modern vehicles use maxi fuses instead of fusible links
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12 Circuit Breakers some circuits such as power windows & power seats use circuit breakerssome circuits such as power windows & power seats use circuit breakers circuit breakers reset themselves when current levels are back to normalcircuit breakers reset themselves when current levels are back to normal (do not need to be replaced like fuses)
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