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Service bulletin TT453

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10176927
Published by NHTSA2020-07-07
Manufacturer's numberTT453
Manufacturer's date2020-06-16
NHTSA componentEQUIPMENT; ELECTRICAL SYSTEM

NHTSA's summary

TECHNICAL TIP BULLETIN TT453: BATTERY BEST PRACTICE INFORMATION. PURPOSE. Revision. AGM Batteries: Tech Tip TT453 combines all battery, testing and charging information from Service Bulletins M1089, M1089A, M1290, M1329, M1391, M1404 and M1418 and Tech Tips TT342 and TT440 into one document. This also updates procedures and equipment to maintain, test or charge all Absorbed Glass Mat (AGM) batteries. Li-Ion Batteries: To explain the benefits and clarify the usage of the Lithium LiFe batteries. Updated to add 2 Ampere-hour (Ah) Li-Ion Battery.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Equipment and accessories

Vehicles listed
HARLEY-DAVIDSON HARLEY-DAVIDSON

Listing a model year does not mean every vehicle of it is concerned: the document says which.