This Peterbilt CAT 3176B wiring is the single-sheet factory drawing titled "CAT C10/C12, 3176B, 3406E Engine Schematic", released as SK24807 revision D from source file SK24807.FM and marked SERVICE ONLY. Note 1 on the sheet states that the schematic applies to Caterpillar 3406E/3176 engines in conventional models. The drawing carries E.C.N. 9801586 dated 12-21-98 and packs the complete engine, cab and fuse/relay harness onto one page, ending with a circuit function table that decodes every circuit number.
Document details and specifications
| Brand | Peterbilt |
| Model coverage | Medium Duty Trucks; conventional models |
| System / Group | Wiring — Engine (CAT 3176B) |
| Publication no. | SK24807 (E.C.N. 9801586) |
| Year / Revision | Revision D, E.C.N. dated 12-21-98 |
| Pages | 1 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Table of contents — what the Peterbilt CAT 3176B wiring shows
- CAT ECM connector (40-pin) with all 40 pin assignments
- Engine power relay, 15 AMP ECM fuse, 20 AMP fuse/relay power and 10 AMP diagnostic power
- Throttle position sensor (power, return, signal), road speed sensor and clutch switch
- J1587 ATA data link and cap, J1922 data link and cap, and J1939 data link and cap with autoshift J1939 option
- Diagnostic connector and cap, firewall connector and engine harness
- Brakesaver application switch, Brakesaver auto/man switch, Brakesaver auto/manual solenoid and the Brakesaver/shutdown relay
- Jake Brake on/off switch and Jake Brake range switch (low, med, high)
- Cruise on/off switch and cruise switch set/resume, cruise switch illumination
- Coolant level sensor, warning beeper, warning light bar connectors
- Engine fan relay with 10 AMP fan fuse, 10 AMP Brakesaver fuse and 5 AMP battery event recorder
- PTO on/off switch, parking brake switch, service brake switch and shutdown connection
- Ignition switch, CAT cold dash shutdown switch, Mark idle timer and SPS idle timer
- Circuit function table for the cab harness and fuse/relay harness
- Notes 1 to 6, including the warning that Brakesaver and idle timer shutdown options cannot be used together
Applies to these models
Per the title block, the Peterbilt CAT 3176B wiring covers Caterpillar C10/C12, 3176B and 3406E engines, and note 1 restricts it to conventional models. Pressure switches on the sheet are shown not pressurised, relays are shown not energised and the clutch switch is shown with the clutch engaged. Options drawn in include the Brakesaver, the battery event recorder, PTO controls wired in series with the parking brake switch, and the autoshift J1939 link. Manufacturer site: Peterbilt official.
Who needs this Peterbilt CAT 3176B wiring
Shops chasing a Brakesaver that will not engage, a dead data link or an intermittent engine shutdown on an older CAT-powered conventional will find this Peterbilt CAT 3176B wiring faster to work from than a scan tool alone, since every circuit number on the sheet is spelled out in the circuit function table.
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