WIRING DIAGRAMS DESCRIPTION J 1T - 73-87ChevyTrucks - Free Download PDF

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1WIRING DIAGRAMS 2DESCRIPTIONWIRING DIAGRAMS9AAll diagrams contained in this manual are based on the latest product information available at the time of publicationapproval. The right is reserved to make changes at any time without notice.SUBJECTWIREIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII III IIIIIIIII III IIIIIIIII IIIIIIIiiIII, .IIIIIIIII IIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIII IIIIIIIIIIIIIIIIIIIIIIII0.5J 18RNTPAGEDescription 2Tracing Circuits on the New Diagrams . . . . . . . . . . 2Basic Electric Circuits . . . . . . 4Diagnostic Tools .". . . . . ". . 9Wire Size Conversion Table . 11On-Vehicle Service 12Circuit Maintenance and Repair 12Weather Pack Connectors . . . . . . 12Metrl.Pack Connectors . . . . . . . . . 14WIring Repair . . . . . . . . 14Special Tools . . . . . . . . . . . . . 1689IWIRE SiZEIN SQ. MM.CIRCUITNUM8ER* lOCATIONOFOTHEREND("ADDRESS")NOTE: IF THE OTHER END IS ON A DIFFERENTPAGE, THE PAGE NUMBER AND"ADDRESS" WILL BE SHOWN.COLOR oFWIREBlK . . . Black8RN . . BrownCHK . . .CheckCR . . . . CrossGRN . GreenNAT NaturalSGl . SingleORN .OrangeGR . . . GrayINSULATIONPPl PurpleTR . . TracerVEL . YellowII . . . ParallelWHT White8lU BlueSTR . StripePNK . . PinkDK . . . Dark8-07595Figure 1-Wire CodingVEHICLECK TruckGVanP ModelST TruckMVanRV TruckThe wiring diagrams in this manual use a format whichreduces the number of lines on a schematic by'showingeach wire connection at the terminals and components,but only one wire for the wiring harness.6. The single vertical line (location of D9 through R9)represents the wirihg harness. The three pointslabeled 6 indicate where wire 139 enters (or leaves)the harness.The wiring diagrams use an alpha-numerical grid andan address for each wire entering the harness to showwhere it comes out. If the other end of the wire is on adifferent page, the page number and address will beshown at the bottom right hand corner of the schematic.Figure 1 explains the wire coding. The contents page liststhe harnesses by section number and name.CRUISE CONTROL GROUND CIRCUITS (Figure 4)1. The system is grounded at the bus bar ground. Theground wire is coded 1508 19 0.8 8lK. Thisindicates that 1508 is a black wire and the nextaddress is 19.TRACING CIRCUITS4. At location M13, wire 150A connects to pin C of thesix terminal connector.2. This format gives the address code for the nextconnection: the address code is N9 (part of 139A N90.8 PNKl8lK).6. At location J13, circuit 150E is the ground wire frompin C of the servo connector.4. Wire 1398 is "addressed" to F4. F4 is located at thecruise control activator connector. It is the 0.8PNKl8lK wire. The code at this location refers backto the splice at N9.5. Wire 139C at this splice is "addressed" to R4. Atlocation code R4, wire 139C is the 0.8 PNKlBLK wireto terminal C of the speed sensor connector. The"address" at this location refers back to the splice atN9. 1 3. There is a· splice in the harness at 19. This isindicated by the triangle with the dot in the center. Ithas four wire codes, indicating that four wires arespliced there: 150A. 1508, 150C and 1500.EXAMPLE: CRUISE CONTROL POWER SOURCEWITH THE MANUAL TRANSMISSION (Figure 2)1. Circuit 139 originates at the fuse block. Refer tofigure 3.3. At location N9. the triangle with the dot in the centerindicates a splice in the harness. The three wirecodes indicate the "addresses" of the three wiresspliced together there. 04 is wire 139A. from thefuse block.""",,.;""""P -" .-. 2. This is where the ground wire enters the harness.5. 150A at location M13 mates to wire 150E, which isaddressed J13.7. Wire 1508 is located at P4 (the bus bar) and is then"addressed" to splice 3 at location 19.8. Wire 150C at splice 3 is addressed R4. location R4shows 150C in cavity 8 of the speed sensorconnector.9. Wire 1500 at splice 3 is addressed H4. Location H4showns 150D in the cruise module connector.10. The electronic module ground and speed sensorground enter the cruise control harness at thislocation.11. The servo ground enters and leaves the servoharness at this location.12. This is where the servo ground enters the cruisecontrol main harness.

spliced there: 150A. 1508, 150C and 1500. 4. At location M13, wire 150A connects to pin C of the six terminal connector. 5. 150A at location M13 mates to wire 150E, which is addressed J13. 6. At location J13, circuit 150E is the ground wire from pin C of the servo connector. 7. Wire 1508 is located at P4 (the bus bar) and is then