This manual provides comprehensive electrical wiring schematics for the Peterbilt 379 and 379E heavy-duty commercial trucks. Produced from 1987 to 2007, these iconic trucks are renowned for their classic styling, robust construction, and extensive customization options, making them a preferred choice for long-haul trucking and specialized applications. The 379 series is celebrated for its driver comfort and premium build quality, appealing strongly to owner-operators. This Electrical Wiring Schematics Manual is an essential resource for understanding the intricate electrical systems that power these durable vehicles, covering a wide range of factory configurations and options, including various sleeper configurations.
The scope of this manual is focused exclusively on the electrical architecture of the Peterbilt 379 and 379E. It details component locations, harness architecture including NAMUX and J1939 systems, and provides in-depth schematics for critical systems such as power distribution, lighting, HVAC, powertrain diagnostics for Caterpillar and Cummins engines, and automated transmissions like Eaton, Allison, and Meritor. The manual is designed to aid technicians and owner-operators in troubleshooting electrical faults, performing repairs, and understanding system interconnections. Its detailed approach to specific circuits, wire colors, and component designations ensures clarity for complex diagnostic and maintenance procedures.
Schematic - 379 379e Model Family Electrical manual
1) INDEX
2) HARNESS A RCHITECTURE
3) LOCATION OF MAJOR COMPONENTS
4) LOCATION OF MAJOR COMPONENTS
5) SYMBOLS INDEX
6) SYMBOLS INDEX ( CONTINUED )
7) SYMBOLS INDEX ( CONTINUED )
8) SYMBOLS INDEX ( CONTINUED )
9) CHARGE AND START
10) POWER DISTRIBUTION - UNSWITCHED CIRCUITS
11) POWER DISTRIBUTION - IGNITION SWITCHED CIRCUITS
12) POWER DISTRIBUTION - ACCESSORY SWITCHED CIRCUITS
13) POWER DISTRIBUTION - CIRCUIT BREAKER - ENGINE
14) TURN SIGNALS / HAZARD LIGHTS
15) STOP LAMPS
16) MARKER / CLEARANCE LAMPS / LEFT POLE / RIGHT POLE
17) HEADLAMPS
18) BACK - UP LIGHT SWITCH
19) DAYCAB AD / LOADLIGHTS
20) SLEEPER AD / LOADLIGHTS - 48" / 63" HIGH ROOF
21) FOG LIGHTS
22) CAB DOOR LOCKS
23) REMOTE KEYLESS ENTRY RELAY - OPTIONAL
24) CAB DOME LIGHT / DOOR LAMPS / DOOR JAMB / ALARM
25) CAB FOOTLIGHTS / CIGAR LIGHTER / POWER POINT / B - PANEL POWER POINT
26) 48" / 63" HIGH ROOF SLEEPER LIGHTS / DOOR LOCK / DOOR JAMB
27) 48" / 63" HIGH ROOF SLEEPER POWER ACCESS OUTLETS
28) 48" / 63" LOW ROOF SLEEPER
29) 70" SLEEPER
30) 36" SLEEPER
31) LH DOOR ELECTRIC WINDOW LIFT
32) RH DOOR ELECTRIC WINDOW LIFT
33) MIRRORS - STANDARD / MOTORIZED / HEATED AND MIRROR CONTROL
34) CB RADIO
35) DASH RADIO
36) CAB ROOF SPEAKERS - CONCERT CLASS / CONCERT CLASS PREMIUM
37) CAB ROOF SPEAKERS - CONCERT CLASS EHD
38) RADIO - 48" / 63" / 70" SLEEPER
39) CLOCK
40) WIPER / WASHER
41) ELECTRIC HORN
42) CAB HVAC
43) SLEEPER HVAC - ALL SLEEPERS
44) SLEEPER LOAD CENTER
45) SLEEPER POWER SUPPLY HARNESS
46) NAMUX
47) BACK - LIGHTING ( +12 VOLTS ) AND PANEL LAMPS DIMMER
48) BACK - LIGHTING NEGATIVE LINKS ( GROUND )
49) OUTSIDE AIR TEMPERATURE
50) FIFTH WHEEL / DIFF LOCK / SUSPENSION DUMP VALVE / SPARE ROCKER SWITCH
51) FUEL LEVEL
52) FUEL FILTER - ACCESSORY POWER
53) PARK BRAKE
54) FORWARD AND REAR DRIVER AXLE TEMP
55) VORAD
56) AIR DRYER
57) FUEL FILTER RESTRICTION
58) TIRE PRESSURE CONTROL SYSTEM ( TPCS ) CAB & CHASSIS
59) AUX TRANSMISSION OIL TEMP
60) EATON ULTRASHIFT TRANSMISSION
61) EATON AUTOSHIFT TRANSMISSION
62) EATON AUTOSHIFT AND ULTRASHIFT TRANSMISSION ( CONTINUED )
63) MERITOR FREEDOMLINE TRANSMISSION
64) WTEC TRANSMISSION ( ALLISON )
65) WTEC TRANSMISSION ( ALLISON ) ( CONTINUED )
66) EATON LIGHTNING TRANSMISSION POWER
67) MAIN CAB ABS CONNECTIONS
68) BENDIX ABS SYSTEM
69) BENDIX ABS SYSTEM ( CONTINUED )
70) BENDIX ABS ( CHASSIS )
71) WABCO ABS SYSTEM ( E-BASIC )
72) WABCO ABS SYSTEM ( E-UNIVERSAL )
73) TRAILER ABS
74) MAIN CAB ENGINE FIREWALL BULKHEAD
75) ENGINE - CAT C11 / C13 AND C15
76) ENGINE - CAT C11 / C13 AND C15 ( CONTINUED )
77) ENGINE - CUM ISM
78) ENGINE - CUM ISC / ISL
79) ENGINE - CUM ISX
80) ENGINE - CUM ISM ( BJ SERVICES )
81) ENGINE - CUM ISM ( BJ SERVICES ) ( CONTINUED )
82) ENGINE - CUM ISM ( BJ SERVICES )
83) ENGINE - CUM ISM ( BJ SERVICES ) ( CONTINUED )
84) ENGINE - CUM ISX ( BJ SERVICES )
85) ENGINE - CUM ISX ( BJ SERVICES ) ( CONTINUED )
86) ENGINE ECU POWER
87) CHASSIS SPARE GROUNDS
88) MAIN CAB SPARE RELAY
89) CHASSIS SENSOR ADD-ON - TRANSFER CASE OIL TEMP / BRAKESAVER OIL TEMP /
GENERAL OIL TEMP / AUX XSMN OIL TEMP # 3 / PTO OIL TEMP
90) ICON2 IDLE CONTROL
91) J1939 ARCHITECTURE
92) TELEMATICS
93) SLEEPER LVD / LVD ADAPTER
94) DUAL STATION CONTROLS ( BJ SERVICES )
95) ENGINE BRAKE CONTROLS
96) ENGINE FAN CONTROLS
97) LIFT AXLE CONTROL ( W/O AUTO-REVERSE )
98) LIFT AXLE CONTROL ( W/ AUTO-REVERSE )
Schematic - 379 379e Model Family Electrical manual
1) INDEX
2) HARNESS A RCHITECTURE
3) LOCATION OF MAJOR COMPONENTS
4) LOCATION OF MAJOR COMPONENTS
5) SYMBOLS INDEX
6) SYMBOLS INDEX ( CONTINUED )
7) SYMBOLS INDEX ( CONTINUED )
8) SYMBOLS INDEX ( CONTINUED )
9) CHARGE AND START
10) POWER DISTRIBUTION - UNSWITCHED CIRCUITS
11) POWER DISTRIBUTION - IGNITION SWITCHED CIRCUITS
12) POWER DISTRIBUTION - ACCESSORY SWITCHED CIRCUITS
13) POWER DISTRIBUTION - CIRCUIT BREAKER - ENGINE
14) TURN SIGNALS / HAZARD LIGHTS
15) STOP LAMPS
16) MARKER / CLEARANCE LAMPS / LEFT POLE / RIGHT POLE
17) HEADLAMPS
18) BACK - UP LIGHT SWITCH
19) DAYCAB AD / LOADLIGHTS
20) SLEEPER AD / LOADLIGHTS - 48" / 63" HIGH ROOF
21) FOG LIGHTS
22) CAB DOOR LOCKS
23) REMOTE KEYLESS ENTRY RELAY - OPTIONAL
24) CAB DOME LIGHT / DOOR LAMPS / DOOR JAMB / ALARM
25) CAB FOOTLIGHTS / CIGAR LIGHTER / POWER POINT / B - PANEL POWER POINT
26) 48" / 63" HIGH ROOF SLEEPER LIGHTS / DOOR LOCK / DOOR JAMB
27) 48" / 63" HIGH ROOF SLEEPER POWER ACCESS OUTLETS
28) 48" / 63" LOW ROOF SLEEPER
29) 70" SLEEPER
30) 36" SLEEPER
31) LH DOOR ELECTRIC WINDOW LIFT
32) RH DOOR ELECTRIC WINDOW LIFT
33) MIRRORS - STANDARD / MOTORIZED / HEATED AND MIRROR CONTROL
34) CB RADIO
35) DASH RADIO
36) CAB ROOF SPEAKERS - CONCERT CLASS / CONCERT CLASS PREMIUM
37) CAB ROOF SPEAKERS - CONCERT CLASS EHD
38) RADIO - 48" / 63" / 70" SLEEPER
39) CLOCK
40) WIPER / WASHER
41) ELECTRIC HORN
42) CAB HVAC
43) SLEEPER HVAC - ALL SLEEPERS
44) SLEEPER LOAD CENTER
45) SLEEPER POWER SUPPLY HARNESS
46) NAMUX
47) BACK - LIGHTING ( +12 VOLTS ) AND PANEL LAMPS DIMMER
48) BACK - LIGHTING NEGATIVE LINKS ( GROUND )
49) OUTSIDE AIR TEMPERATURE
50) FIFTH WHEEL / DIFF LOCK / SUSPENSION DUMP VALVE / SPARE ROCKER SWITCH
51) FUEL LEVEL
52) FUEL FILTER - ACCESSORY POWER
53) PARK BRAKE
54) FORWARD AND REAR DRIVER AXLE TEMP
55) VORAD
56) AIR DRYER
57) FUEL FILTER RESTRICTION
58) TIRE PRESSURE CONTROL SYSTEM ( TPCS ) CAB & CHASSIS
59) AUX TRANSMISSION OIL TEMP
60) EATON ULTRASHIFT TRANSMISSION
61) EATON AUTOSHIFT TRANSMISSION
62) EATON AUTOSHIFT AND ULTRASHIFT TRANSMISSION ( CONTINUED )
63) MERITOR FREEDOMLINE TRANSMISSION
64) WTEC TRANSMISSION ( ALLISON )
65) WTEC TRANSMISSION ( ALLISON ) ( CONTINUED )
66) EATON LIGHTNING TRANSMISSION POWER
67) MAIN CAB ABS CONNECTIONS
68) BENDIX ABS SYSTEM
69) BENDIX ABS SYSTEM ( CONTINUED )
70) BENDIX ABS ( CHASSIS )
71) WABCO ABS SYSTEM ( E-BASIC )
72) WABCO ABS SYSTEM ( E-UNIVERSAL )
73) TRAILER ABS
74) MAIN CAB ENGINE FIREWALL BULKHEAD
75) ENGINE - CAT C11 / C13 AND C15
76) ENGINE - CAT C11 / C13 AND C15 ( CONTINUED )
77) ENGINE - CUM ISM
78) ENGINE - CUM ISC / ISL
79) ENGINE - CUM ISX
80) ENGINE - CUM ISM ( BJ SERVICES )
81) ENGINE - CUM ISM ( BJ SERVICES ) ( CONTINUED )
82) ENGINE - CUM ISM ( BJ SERVICES )
83) ENGINE - CUM ISM ( BJ SERVICES ) ( CONTINUED )
84) ENGINE - CUM ISX ( BJ SERVICES )
85) ENGINE - CUM ISX ( BJ SERVICES ) ( CONTINUED )
86) ENGINE ECU POWER
87) CHASSIS SPARE GROUNDS
88) MAIN CAB SPARE RELAY
89) CHASSIS SENSOR ADD-ON - TRANSFER CASE OIL TEMP / BRAKESAVER OIL TEMP /
GENERAL OIL TEMP / AUX XSMN OIL TEMP # 3 / PTO OIL TEMP
90) ICON2 IDLE CONTROL
91) J1939 ARCHITECTURE
92) TELEMATICS
93) SLEEPER LVD / LVD ADAPTER
94) DUAL STATION CONTROLS ( BJ SERVICES )
95) ENGINE BRAKE CONTROLS
96) ENGINE FAN CONTROLS
97) LIFT AXLE CONTROL ( W/O AUTO-REVERSE )
98) LIFT AXLE CONTROL ( W/ AUTO-REVERSE )
