Target Audience:
Professional technicians, Porsche specialists and DIY owners performing electrical diagnostics and repairs
Vehicle Segment:
Flagship V8 grand tourer of the Porsche range for 1986
Key Advantage:
Complete OEM wiring diagram set for the 1986 928S, including full-color schematics with component locations and connector pinouts
Competitors:
Contemporary GT rivals included Jaguar XJS and Mercedes-Benz S-Class coupes
Wiring Diagrams:
Complete schematics for every electrical system on the 1986 928S
Printability:
All pages printable for use in the garage or workshop
Delivery:
Instant digital download, no shipping or waiting
Coverage Areas:
Complete electrical system of the 1986 Porsche 928S, including power distribution, grounds, harness routing and component schematics
Manual Type:
Factory wiring diagram / electrical troubleshooting manual
Delivery Method:
Instant download on completion of payment
Page Count:
Complete diagram set, full page count shown in the download index
Power Distribution:
Fuse and relay layout, current flow diagrams for all circuits
Starting System:
Starter, ignition switch and related wiring
Charging System:
Alternator, voltage regulator and battery circuits
Ignition System:
Ignition coil, distributor and control unit wiring for the 5.0L V8
Fuel Injection:
Bosch LH-Jetronic fuel injection and EZK ignition wiring
Lighting Exterior:
Headlights, fog lights, turn signals, tail lights and license plate lights
Lighting Interior:
Interior illumination, glovebox and luggage compartment lights
Instrument Cluster:
Gauges, warning indicators and speedometer circuits
Climate Control:
Automatic heating and air conditioning system wiring
Power Windows:
Window regulators, switches and door lock wiring
Seats:
Power seat adjustment and seat heating circuits
Wipers and Washers:
Windshield and headlamp wiper/washer system wiring
Audio System:
Radio, speakers and antenna circuits
ABS Brakes:
Anti-lock brake system control unit and sensor wiring
Cruise Control:
Cruise control actuator and switch circuits
Central Locking:
Central locking pump and door actuator wiring
Ground Points:
Complete ground location diagrams
Harness Routing:
Wire gauge, color codes and connector views
Component Locations:
Relay and component placement throughout the vehicle
Connector Pinouts:
Detailed connector views and terminal identification
Wire Color Codes:
Full factory color code legend for circuit tracing
Depth:
OEM-level schematics with component and connector detail sufficient for full electrical troubleshooting
Illustrations:
Detailed wiring schematics and diagrams throughout
Parts Information:
Component identification and reference designations as used in factory diagrams
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine:
4.7L (4,957 cc) all-aluminum 32-valve V8
Fuel System:
Bosch LH-Jetronic electronic fuel injection
Ignition:
Bosch EZK electronic ignition
Compression Ratio:
10.0:1
Output:
Approximately 310 hp (SAE) for US-spec 928S
Drive Layout:
Front engine, rear transaxle
Wheelbase:
Approximately 2,555 mm (100.6 in)
Length:
Approximately 4,490 mm (176.8 in)
Curb Weight:
Approximately 1,640 kg (3,615 lb)
Body Style:
2-door fastback coupe
ABS:
Anti-lock braking system standard on the 928S
Passive Features:
Three-point inertia reel seat belts, integrated roll protection
Active Features:
ABS, power-assisted four-wheel disc brakes
Crash Test Ratings:
N/A - period vehicle predates modern crash rating programs
Infotainment:
Factory radio/CD head unit circuits covered in the audio wiring diagrams
Driver Assistance:
Cruise control system wiring included
Climate Control:
Fully electronic automatic climate control system
Instrumentation:
Fully electronic gauge cluster and on-board warning system
Maintenance and Electrical Wear
Fluid Specifications:
N/A - this title covers wiring diagrams, not fluid service specs
Service Intervals:
N/A - mechanical service intervals not covered in this diagram set
Common Electrical Issues:
Aged harness insulation, corroded ground points and fuse panel contacts
Common Wear Items:
Ignition switch contacts, window switch contacts and headlamp relay contacts
Known Issues:
Alternator wiring and ground strap corrosion are frequent 928 electrical faults
Manufacturer:
Porsche AG, Stuttgart, Germany
Model Evolution:
The 928 launched in 1978 as Porsche's V8 grand tourer; the S variant arrived in 1980 with a larger 4.7L engine
Production Location:
Stuttgart-Zuffenhausen, West Germany
1986 Update:
The 1986 928S received Bosch LH-Jetronic fuel injection and EZK ignition
