Description
This Harley-Davidson starter/brake relay (OEM 31504-91A) is a high-quality replacement electrical component designed for reliable performance in starting and braking circuits. Built as a 12V, 30-amp relay with an integrated diode, it ensures proper electrical flow while protecting sensitive components from voltage spikes.
This relay is commonly used across multiple Harley-Davidson models for starter, brake light, fuel pump, and ignition system functions, making it a versatile and essential component for maintaining proper electrical operation.
Ideal for replacing worn or faulty relays, this unit helps prevent starter issues, intermittent electrical failures, and overheating of handlebar switches by reducing current load.
Features:
OEM Part Number: 31504-91A
Type: Starter / Brake / Multi-use Relay
12 Volt, 30 Amp capacity
Built-in diode for voltage spike protection
5-pin configuration
Heavy-duty electrical contacts
Direct OEM replacement fit
Reliable performance for starting and electrical systems
Fitment:
Harley-Davidson Touring Models:
1991–1994 FLTC, FLHT, FLTC-U, FLHTC-U
1994 FLHR Road King
1995 FLHT, FLHTC, FLHTCU, FLTC-U, FLHR
Additional Compatibility:
1993–2004 Sportster models
1995–1999 Dyna models
1995–1999 Softail models
(Verify application based on electrical system configuration)
Notes:
Used as starter relay, brake relay, or multi-function relay depending on model
Replaces OEM Harley-Davidson 31504-91A and 31504-91B
Compatible with models using diode-equipped relay systems
Always confirm part number and connector style before purchase
