Dedicated Subsystem WorkbenchPlatform Gen: 1984–1999

1991 Harley Davidson Evolution 80ci (Dyna / Softail / FXR / Touring) Fuse Box Diagram, Amperages & Relay Diagnostics

Complete fuse box location, blade fuse slot mappings, ISO color codes, blown fuse symptoms and dark current parasitic drain testing for 1991 Harley Davidson Evolution 80ci (Dyna / Softail / FXR / Touring).

Technical PassportOEM VERIFIED

Engine

1340cc

Cooling

Air-Cooled

Final Drive

Belt Drive

Engine Oil

2.84 L (3.00 US qt)

Spark Plug

HD 5R6A / Champion RN12YC / NGK BPR5ES

Front Tire

MT90B16 (Touring) / 100/90-19 (Dyna) / MH90-21 (FXST Softail)

Browse Flagship Teardowns →

Gen 1984–1999

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 1984 through 1999.

Select Model Year:(Active: 1991)
16 Production Years (1984–1999)

1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999

Suggested Items3 Verified Workshop Consumables Available for this Job

View Suggested Items ↓

CIRCUIT HEALTH DECKMain: 30A Main Thermal Circuit BreakerSpec: < 1.5 mA Quiescent

FUSE BOX, RELAY ASSIGNMENTS & PARASITIC DRAIN ISOLATOR

Fuse & Relay Location: Behind right/left side cover or under seat; 30A main circuit breaker mounted adjacent to battery tray.

Select Fuse to Inspect Circuits & Failure SymptomsFormat: Auto-Reset Thermal Circuit Breakers (15A/30A) + Blade Fuses on late 90s

15A

SLOT: IGNITION

Ignition & Coil Circuit

Rating: 15 Amps

Downstream Protected Components:

Electronic Ignition ModuleIgnition Coil (+12V)VOES (Vacuum Operated Electric Switch)

Mechanic Diagnostic: Symptoms If Blown

Starter spins engine over freely but zero spark delivered to spark plugs.

Shop Replacement Fuses

Official NHTSA Safety Recalls & Technical Bulletins

0 Open Campaigns (Clean)

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

No Active Federal Safety Recalls Reported

The U.S. DOT National Highway Traffic Safety Administration (NHTSA) records zero open safety recall campaigns for the 1991 Harley Davidson Evolution 80ci (Dyna / Softail / FXR / Touring) platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.

Explore Other Subsystems for this 1991 Harley Davidson Evolution 80ci (Dyna / Softail / FXR / Touring)

Jump straight into dedicated factory specifications and interactive workshop diagnostic engines.

← Full Motorcycle Overview

Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

Open Dedicated Workbench →

Subsystem Guide/fluids

Fluids & Capacities

Oil: 2.84 L (3.00 US qt) • Coolant: N/A • Brake: DOT 5 Silicone-Based (Purple) - strictly NEVER mix DOT 5 with glycol DOT 4

Open Dedicated Workbench →

Subsystem Guide/compression

Compression & Leakdown

Ratio: 8.5:1 • Std: 140-160 PSI • Limit: 120 PSI

Open Dedicated Workbench →

Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

Open Dedicated Workbench →

Subsystem Guide/fuel-delivery

Fuel Delivery & TB Sync

Idle: N/A • Rail Pressure: N/A • Vacuum: N/A

Open Dedicated Workbench →

Subsystem Guide/electrical

Charging & Battery

Battery: YTX20L-BS (Dyna/Softail) / Y60-N24AL-B (Touring) • CCA: 310 • Regulated: 13.8 - 14.4 V DC at 3,000 RPM

Open Dedicated Workbench →

Subsystem Guide/tires

Tires & Gearing

Front: MT90B16 (Touring) / 100/90-19 (Dyna) / MH90-21 (FXST Softail) • Rear: MT90B16 or 130/90B16

Open Dedicated Workbench →

Subsystem Guide/suspension

Suspension & Sag

Front Travel: 120 mm • Rear Travel: 76 mm

Open Dedicated Workbench →

Subsystem Guide/maintenance

Maintenance Schedule

Oil: Every 2,500 - 5,000 mi (4,000 - 8,000 km) mi • Valves: N/A • Plugs: Every 5,000 mi (8,000 km) mi

Open Dedicated Workbench →

← Return to Full Comprehensive Motorcycle Specification Hub (1991 Harley Davidson Evolution 80ci (Dyna / Softail / FXR / Touring))

Looking for direct-fit parts for this 1991 Evolution 80ci (Dyna / Softail / FXR / Touring)?

Browse authentic verified parts, motor oils, filters, brake pads, and tires that fit this exact bike.

Browse Direct-Fit Parts