Dedicated Subsystem WorkbenchPlatform Gen: 2017–2024

2018 KTM 390 Duke 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 2018 KTM 390 Duke.

Gen 2017–2024

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2017 through 2024.

Select Model Year:(Active: 2018)

2017 2018 2019 2020 2021 2022 2023 2024

Engine

373cc

Drive

520

Cooling

Liquid-Cooled

CIRCUIT HEALTH DECKMain: 30A Blade / Starter RelaySpec: < 2 mA Quiescent

FUSE BOX, RELAY ASSIGNMENTS & PARASITIC DRAIN ISOLATOR

Fuse & Relay Location: Fuse box 1 & 2 located under rider seat; Main 30A fuse mounted directly onto starter relay switch behind left side panel.

Select Fuse to Inspect Circuits & Failure SymptomsFormat: Mini Blade (ATM)

10A

SLOT: IGNITION

Keihin / Bosch Engine Management

Rating: 10 Amps

Downstream Protected Components:

ECU LogicIgnition Stick CoilsCrank Pulse Sensor

Mechanic Diagnostic: Symptoms If Blown

Engine cranks but no spark; engine will not run.

Shop Replacement 10A Fuses

Official NHTSA Safety Recalls & Technical Bulletins

2 Active Campaigns

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

Verify VIN on NHTSA.gov

The U.S. National Highway Traffic Safety Administration reports 2 safety recall campaigns associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #25V740000FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP

Received: 30/10/2025▼

Defect Description

KTM North America, Inc. is recalling certain 2024 390 Duke, 250 Duke, 990 Duke, Husqvarna Vitpilen 401, and Husqvarna Svartpilen 401 motorcycles. The seal on the fuel filler cap may develop cracks and leak fuel.

Safety Hazard / Consequence

A fuel leak increases the risk of fire or injury.

Factory Remedy & Repair Action

Dealers will inspect and replace the fuel cap gasket, free of charge. Owner notification letters were mailed December 15, 2025. Owners may contact KTM customer service at 1-888-985-6090. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov March 31, 2026.

NHTSA #25V825000ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

Received: 01/12/2025▼