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August 26, 2025 Service bulletin

Midtronics GRX-3110 and DCA-8000 software. purporse

Harley-Davidson technical service bulletin M1391A for 2010-2011, 2013-2019 Harley-Davidson Flhtcu, 2010-2025 Harley-Davidson FLHX and 2010-2024 Harley-Davidson Flhtk and others.

Bulletin number
M1391A
Component
Electrical system
Summary
SERVICE BULLETIN M1391A (REV T): MIDTRONICS GRX-3110 AND DCA-8000 SOFTWARE. PURPORSE: Revision T. The purpose of this bulletin is to inform the dealer network that a software update to the GRX-3110 and DCA-8000 is now available. DYNAMIC DIAGNOSTIC CHARGER SYSTEM (PART NUMBER: DCA-8000). [Rev T] Updated: New Software Update, Previous Software Updates and DCA-8000. Added: 192-210335P. Software update 192-210335P for GRX-3110 and DCA-800 to add new battery part numbers.

Owners of these vehicles have filed 169 complaints in the electrical category.

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