1989 WIRING DIAGRAMS R-V, P TRUCK MODELS
1989WIRING DIAGRAMSR-V, P TRUCKMODELSWhen reference is made in this manual to a brand name, number, or specific tool, an equivalent product maybe used in place of the recommended itemAll information, illustrations, and specifications contained in this manual are based on the latest productinformation available at the time of publication approval. The right is reserved to make changes at any timewithout notice.No part of this publication may be reproduced, stored in any retrieval system or transmitted, in any form or byany means, including but not limited to electronic, mechanical, photocopying, recording or otherwise, without theprior written permission of the GMC Truck Division of General Motors Corp. This includes all text, illustrations,tables and charts.X-8940 1988 General Motors CorporationAH rights reservedAugust, 1988Printed in U.S.A.
WIRING DIAGRAMS 2DESCRIPTIONWIRING DIAGRAMSAll diagrams in this manual are based on the latest product information at the time of publication approval. The right isreserved to make changes at any time without notice.SUBJECTDescriptionTracing CircuitsBaste Electric CircuitsCircuit DiagnosisAbbreviation ListDiagnosticWire Size Conversion TableOn-Vehicle ServiceCircuitMaintenanceWeather Pack ConnectorsMetri-Pack ConnectorsWiring RepairSpecial ToolsPAGEToolsandVEHICLER/VP 1B-1Figure 1—Wire Coding The diagrams are to be traced from the source ofelectricity (the battery positive post) to ground. Theground may be a chassis ground on a certain component (such as an alternator or a starter), or a wirefrom a component to a chassis or frame ground(such as used on the electronic control module andinstrument panei). All grounds are connected to thenegative battery post through body and/or anginaground wires and straps. Many times the source of the electricity is shown asthe ignition switch or the fuse block. This is done toeliminate the confusion that would occur if the entirepower distribution was shown in each circuit. For adetailed outline of the power to the ignition switch orthe fuse block, refer to the power distribution circuit. The ground portion of the circuit (usually circuit 150or 151) may be shown entirely, or it may refer to theground distribution circuit in order to avoid confusion of listing ail the grounds in one splice on a single page. For ease of diagnosis, ali splices and grounds areidentified by number, and all the wires on a commonsplice or ground are identified by circuit number,size (in mm) and color. Each component or circuitcommon to s spliced wire is called out by the pagenumber of that circuit. This will help identify and diagnose multiple electrical problems that could occurin a truck. All connectors are shown with their part numbers tosave time when ordering these parts. Switches are shown in their at rest positions, unlessotherwise marked.TRACING CIRCUITSFigures 1 through 3 are examples of how the wiringdiagrams are laid out., and will be referred to, throughoutthis description.In order to trace a circuit on these diagrams, start fromthe source, the battery. In figure 2, the battery positivecircuit is a 19.0 mm black wire. This wire runs from thebattery to the starter motor, and supplies power to thestarter motor post.Once you have determined the source of power to yourcomponent, from the Power Distribution Circuit (figure 2),then refer to the individual circuit you are working on formore detail about that circuit. (Figure 3 shows the startingcircuit).In figure 3, the starter motor circuit is shown. This circuitshows the battery feed coming from the PowerDistribution page. The cable comes from the battery tothe start ? positive post. At the starter post, other circuitssuch as the generator, ignition switch, and electroniccontrol module are fed.When the ignition switch is in the start position, powerflows from circuit #2 through the switch, to circuit #6.Circuit #6 goes through the clutch switch with anautomatic transmission. At the clutch switch the circuit isopened, unless the dutch is depressed.At the solenoid the current flowing from circuit #6closes the soiertoid, allowing current to flow from thebattery at circuit #1 to the starter motor. The currentflowing to the starter motor, causes the starter motor tospin.BASIC ELECTRICAL CIRCUITSAn electrical circuit starts from a supply of electricityback to a load and then conducts the electricity back tothe supply of electricity. There should be a device to openand close the circuit, and a protective device to open thecircuit in case too much current is drawn into the circuit byan overload condition. Electrical circuits can be set up asseries circuits, parallel circuits or series/parallel' circuits.The circuits in trucks are usually parallel circuits.
WIRING DIAGRAMS 5WIRING DIAGRAMS 6path. For example the switch controlling the headlights isat the power end of the circuit while the door switchcontrolling the domelight completes the ground path.Relays are remotely controlled switches. They are usedin high current circuits and in circuits controlled bysensors.Relays are designed so that a small current circuit wi!3he able to control a large current circuit.CIRCUIT BREAKERS (Figure 7)Circuit breakers are another form of circuit protector.There are two types of circuit breakers; automatic resetand remote reset.The automatic reset breaker opens when excesscurrent heats a bimetallic strip, causing the strip to bendand open a set of contacts. Then the strip cools andcloses the contacts. So the circuit breaker opens andcloses until the excess current condition is corrected orthe circuit is disconnected from the power supply.The remote reset circuit breaker has a heating wirewound around the bimetallic strip. When an excesscurrent happens, the strip heats, bends, and opens thecontacts. Then a small current flows through the heatingwire, keeping the strip hot and the contacts open. Thistype of breaker will stay open until either the power supplyis disconnected from the circuit or the breaker is removedfrom the circuit. Then the breaker can cool and reset.Figure 4—Basic CircuitsSERIES CIRCUITS (Figure 4 and 5)In a series circuit, the electrical devices are connectedtogether to form one current path to and from the powersupply. In a series circuit the same current flows throughall of the devices.PARALLEL CIRCUITS (Figure 5)In a parallel circuit, the electrical devices are connectedto form more than one current path to and from the powersupply. In a parallel circuit the supply voltage is the samein each current path.Figure 5—Series/Parallel CircuitsFUSIBLE LINKA fusible link is a section of wire that is usually fourgage sizes smaller than the circuit it protects. A specialinsulation is used that swells when heated by the wire.Fusible links are usually found in the engine compartmentharnesses. The function of the fusible link is to melt openwhen an overload occurs, thus preventing any damage tothe circuit.CIRCUIT DIAGNOSISFigure 7—Circuit ControllersFUSES (Figure 8)The most common protector in the vehicle circuit is afuse. A fuse consists of a fine wire or strip of metal insidea glass tube or plastic housing. The strip melts andinterrupts the flow of current in the circuit when there Is anoverload caused by an unwanted short or ground. Thefuse is designed to melt before the wiring or electricalcomponents in a circuit can be damaged. Naturally, thecause must be located and corrected before the fuse isreplaced or the new fuse will also blow.SERIES/PARALLEL CIRCUIT (Figure 5)A series/parallel circuit consists of a single current pathcircuit and a circuit with more than one current path toand from" the voltage supply.CIRCUIT COMPONENTS (Figure 6)The usual circuit path starts at the power supply whichis the battery/generator system. Next in the circuits is thecircuit protection component which cars he a fusible link, afuse, or a circuit breaker. Then the circuit goes to thecircuit controller which can be a switch or a relay. Fromthe circuit controller the circuit goes into the circuit load.The circuit load can be one light or many lights in parallel,an electric motor or a solenoid. After the electricity haspassed through the load it must return to the powersupply via the ground path. The ground path can be awire in the harness or it could be through the loadhousing into the body or frame, thus returning theelectricity to the power supply. The body and frame areconnected by flexible ground straps.CIRCUIT LOADS ( F i g u r e 7)Circuit loads are the components that use most of theenergy in circuit. The energy converts to motion, light, orheat, lights, motors, and engine heaters are the mostcommon loads in circuits.Since different circuits handle different amounts ofcurrent, fuses of various ratings are used. Fuses are ratedin amperes. Be sure to replace a blown fuse with a fuse ofthe connecting rating.Figure 6--Circuit ComponentsCIRCUIT CONTROLLERS (Figure 7)Circuit controllers consist of switches or relays.Switches are usually operated by a mechanical meanssuch as a hand or lever. Switches are usually at thebeginning of a circuit but can be used to control a groundA clear understanding of the circuit and a wiringdiagram are needed for effective diagnosis. Use a logicalsequence of testing to find the trouble. Use the diagnostictools. After the trouble is fixed, make sure the circuitworks correctly.CIRCUIT MALFUNCTIONSThere are three electrical conditions that can cause anonworking circuit; an "Open Circuit", a "Short Circuit",or a "Grounded Circuit"OPEN CIRCUIT (Figure 8)An open circuit occurs whenever there is a break in thecircuit. The break can be corrosion at the connector, awire broken off in a device, or a wire that burned openfrom too much current.SHORT CIRCUIT (Figure 9}A short circuit happens when the current bypasses partof the normal circuit. This bypassing is usually caused bywires touching, salt water in or on a device such as aswitch or a connector or solder melting and bridgingconductors in a device.
WIRING DIAGRAMS 7GROUNDED CIRCUIT(Figure 10)A ground circuit is like a short circuit but the currentflows directly into a ground circuit that is not part of theoriginal circuit. This may be caused by a wire rubbingagainst the f r a m e or body. Sometimes a wire will breakand fall against metal that is connected electrically to theground side of the power supply. A grounded circuit mayalso be caused by deposits of oil, dirt and moisturearound connections or terminals, which provide a goodpath to ground.WIRING DIAGRAMS 8EFE—Early Fuel EvaporationEGR—Exhaust Gas —ControlMOD—ModuleENG-—EngineEPR—Exhaust Pressure RegulatorESC—Electronic Spark ControlEST—Electronic Spark TimingEVRV—Electronic Vacuum Regulator ValveEXC---ExceptF-PUMP—Fuel PumpFLASH—FlasherFRT—Front4WD—Four Wheel DriveFigure 8- -Open GreenFigure 10—Grounded CircuitFigure 9—Short CircuitABBREVIATION LISTThe following is a list of abbreviations used in the wiringdiagrams. The abbreviations have been developed insuch a way that their meaning should be clear.Use this page as a reference to determine the meaningof an abbreviation if necessary.A --- AmpereA/C--- Air ConditionerACC --AccessoryA.I.R.---Air Injection ReactionAIR/COND—Air ConditionerALDL—Assembly Line Diagnostic SM—AssemblyASSY- aryBAT—BatteryBATT— BatteryB I--LEV—B i-LevelBLK—BiackBUT- BackupBUZZ—BuzzerCIR/BRK—Circuit BreakerCIRC- -CircuitCLSTR- mpressorCONN—ConnectorPONV— —DiscreteDIST—DistributorDIV— DiverterDM—DomeDR—DoorECM—Electronic Control ModuleHAND—HandlingHAZ—HazardHD—Heavy DutyHD LP—HeadlampHEI—High Energy IgnitionHI—HighHTR—HeaterIAC-Idle Air strument .PanelINC—IncreasedIND—IndicatorINJ —InjectorINST PNL Instrument Pane!INTER—InteriorLD—Light DutyLH—Left HandLO—LowLP—LampLPS- -LampsLT LightLTR- UghterM—MotorMAN—ManualMAP—Manifold Absolute —MultipleNAT--NaturalNEUT—NeutralNO—Normally OpenNC—Normaiiy Right HandRPO—Regular Production Throttle Body InjectionTCC-—Torque Converter ClutchTEMP--TemperatureT/L-—Tail LampTRANS- -TransmissionTYP-- e Speed SensorW/—WithW/O—WttmutW/S—WindshieldW WASHER—Window ow
WIRING DIAGRAMS 10WIRING DIAGRAMS 9DIAGNOSTIC TOOLS30. Power Source31 Circuit Breaker32. Switch (Closed)33 Ammeter34. LoadB-0608640.41.42.43.44.Power SourceCircuit BreakerSwitch (Open)OhmmeterLoad50.51.52.53.54.UNPOWERED TEST LIGHT (Figure 12)This tool consists of a 12 volt light with leads. The endsof the leads usually have alligator clamps, but variouskinds of probes, terminal spades, and special connectorsare used also.NOTICE: The followmg instruments: Ammeter,Voltmeter, a n d Ohmmeter,eachhave aparticular is test light is used mainly for testing componentsthat are disconnected from the vehicle power supply. Thepower test light is also useful for testing suspected highresistance points in a circuit such as connectors andground circuits that are corroded or loose.When using a ammeter or voltmeter, and thevalue being tested is unknown always use thehighest scale first and work downward to amidscale reading whenever possible. This willavoid damage to the Instrument.Never use an ohmmeter in a power circuit, oras a substitute for a vohmeter or ammeter asdamage to the instrument will result.AMMETER (Figure 12 and 15)Disconnect the circuit from the power source beforeconnecting the ammeter. The ammeter measures theamount of electrical current, amperes, moving through aconductor. The ammeter must be placed in series with thecircuit being tested. Be sure that the ammeter's positiveterminal is connected to the positive (battery) side of thecircuit and is negative terminal to the negative (ground)side of the circuit.JUMPERThe jumper is usually a long wire with alligator clamps.A version of the jumper has a fuse holder in it with a 10Amp fuse. This will prevent damaging the circuit if thejumper is connected in the wrong way.OHMMETER (Figure 13 and 15)The ohmmeter is an instrument designed to indicateresistance in ohms, it is used to test the condition of a unitdisconnected from the circuit.The jumper is used to locals opens in a circuit. Oneend of the jumper is attached to a power source and thenthe other end is attached to the load in the circuit, i.e.;light, motor. If the load works, try "jumping" to circuitpoints that are progressively closer to the power supply.When the circuit load stops working, the open has beenlocated.Ohmmeter CalibrationWhen the ohmmeter probes are connected together, acircuit is completed causing the meter needle to deflectThe needle should read ZERO ohms, if it does not, rotatethe CAL or ADJ knob to ZERO the needle.The jumper is also used to test components in thecircuit such as connectors, switches, and suspected highresistance points.B-06155A 3 VoltsB 7 VoltsC 13 VoltsFigure 14—VoltmeterFigure 13 --OhmmeterPOWERED TEST LIGHT (Figure 11)This light is a pencil shaped unit with a self containedbattery, a 1 5 volt light bulb, a sharp probe and a groundlead fitted with an alligator clip.VOLTMETER SCALE: 0 Volts through 15 VoltsB-06087Figure 12—AmmeterThe unpowered test light is used on an open circuit.One lead of the test light is grounded and the other lead ismoved around the circuit to find the open. Depending onthe physical layout of the circuit, sometimes it will beeasier to start at the power supply and other times it iseasier to start at the Circuit load or ground circuit.Power SourceCircuit BreakerSwitch (Closed)VoltmeterLoadWhen the probes are held apart, the needle moves tothe maximum (infinite) resistance side of the scale.The meter is now ready for use. Refer to figure 14 for atypical application of the ohmmeter.VOLTMETER (Figures 14 and 15)The voltmeter (properly observed) will give thetechnician more information than the ammeter, ohmmeterand test light combined, its application for troubleshootinghere is to measure the electrical pressure (voltage) drop ina resistance circuit (figure 14).Io use a voltmeter for troubleshooting an electricalproblem, connect it in parallel with the existing circuit(figure 10). If the voltmeter is connected in series with thecircuit being tested, the nature of the circuit would bechanged and the reading would have no particular valueor use. Connect the meter terminals according to polarityas shown in figure 14.The dash mounted voltmeter (in the vehicle) shouldalso be observed for monitoring proper operation of thegenerator battery cranking motor, and cranking circuit. Inthis application, battery voltage drop can be monitoredwhile the engine is cranking; and after the engine isrunning, generator output voltage cars be monitored. Thiscan be a valuable first step prior to diagosing otherelectrical problems.WIRING HARNESS AND WIRESEvery wire is a specific size with colored or stripedinsulation that is indicated on the wiring diagrams.Insulation colors help to trace circuits and to make properconnections. Abbreviations and symbols used forindicating wire insulation colors and patterns are yDKDarkSome wires are grouped and taped together orencased in a split plastic casing. This grouping of wires iscalled a harness. For some purposes, it is more practicalto use a single wire protected by a braided tubing called aloom.AMMETER SCALE: 0 Amperes through 10 AmperesE 1 AmpereF 1.8 AmperesG 9 AmperesOHMMETER SCALE: 0 Ohms through InfinityH 5 OhmsI 36 O h m sJ 115 O h m sK 350 O h m sFigure 1 5 - M e t e r Scales
WIRING DIAGRAMS 11Wiring harnesses are joined by using a multiple plugand receptacle connector block, or a terminal postchassis junction block. In the instrument panel areaplastic insulated blade-type connectors and screw-typeterminals are used.Each harness or wire must be held securely in place byclips or other holding devices to prevent chafing of theWIRE SIZECONVERSION 3.019.032.040.050.062.0insulation.WIRE SIZEWire size in a circuit is determined by the amount ofcurrent, the length of the circuit and the voltage dropallowed. Wire size is specified using the metric gage. Themetric gage describes the wire size directly in crosssection area measured in square millimeters.242220181614121086421000MAINTENANCE AND REPAIRAll electrical connections must be kept clean and tight.Loose or corroded connections may cause a dischargedbattery, difficult starting, dim lights, and possible damageto the generator and regulator. Wires must bo replaced ifinsulation becomes burned, cracked, or deteriorated.To splice a wire or repair one that is frayed or brokenalways use rosin flux solder to bond the splice andinsulating tape to cover all splices or bare wires.WRING CONNECTOR TERMINALREPLACEMENT (BLADE TYPE)Figure 17—Resetting the Lock TangMETRl-PACK CONNECTORSWEATHER-PACK CONNECTORSThe Metri-Pack connectors use a pull-to-seat typeterminal, as shown in figure 19. The special tool requiredto remove the terminal is J-35689-A terminal remover. Ifremoval is attempted with an ordinary pick, there is agood chance that the terminal will be b
circuit protection component which cars he a fusible link, a fuse, or a circuit breaker. Then the circuit goes to the circuit controller which can be a switch or a relay. From the circuit controller the circuit goes into the circuit load. The circuit load can be one light or many lights in parallel, an electric motor or a solenoid.
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4 Wiring Diagrams TP-6712 4/10 Wiring Diagrams Use the Wiring Diagram Cross-Reference chart to determine the wiring diagram version number for a given model number and spec number. Then find that version number, the controller type, and the alternator type on the Wiring Diagrams Reference chart to determine the wiring diagram numbers for your unit.
TYPES OF ELECTRICAL WIRING There are following types of electrical wiring. 1. Cleat wiring or Temporary wiring 2. Wooden or Batten wiring 3. Casing and Capping 4. Conduit Wiring 5. Trunking Wiring 1 Cleat Wiring or Temporary Wiring AIR UNIVERSITY, PAF COMPLEX E-9, ISLAMABAD It is a temporary wiring used for function and construction work.
Chrysler - Sebring 4D Sedan USING MITCHELL1'S WIRING DIAGRAMS For information on using these wiring diagrams, see USING MITCHELL1'S SYSTEM WIRING DIAGRAMS article. AIR CONDITIONING 2007 Chrysler Sebring Limited 2007 SYSTEM WIRING DIAGRAMS Chrysler - Sebring 4D Sedan me
Mazda - MX-5 Miata USING MITCHELL1'S WIRING DIAGRAMS For information on using these wiring diagrams, see USING MITCHELL1'S SYSTEM WIRING DIAGRAMS article. AIR CONDITIONING MITCHELL 1 ARTICLE - 2004 SYSTEM WIRING DIAGRAMS Mazda - MX-5 Miata Page 1 of 36
8 C 01000 AT6-18F(Z) with COS Air Handler diagram Air Handler Wiring Diagrams - Table of Contents. L-2295B Air Handler Wiring Diagrams 4. L-2295B Air Handler Wiring Diagrams 5. L-2295B Air Handler Wiring Diagrams 6 DWG CREATED BY CAD618-03 TRANS L2 LABEL BLOCK TERMINAL L1 NC COMP L 1 COMP FAN PUMPPUMP L 2 L 2 L 2 L 1 VALVE FAN
a time period. There are seven behavioral diagrams: Use Case Diagrams, Activity Diagrams, State Machine Diagrams, Communication Diagrams, Sequence Diagrams, Timing Diagrams and Interaction Overview Diagrams. UML 2 has introduced Composite Structure, Object, Timing and Interaction Overview diagrams.
node diagrams (N diagrams), node-link diagrams (NL diagrams) and node-link-groups diagrams (NLG diagrams). Each of these diagrams extends the previous one by making more explicit a characteristic of the input data. In N diagrams, a set of objects is depicted as points in a two or three dimensional space; see Figure1a. Clusters are typically .
