# Service bulletin WSB\-07

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.

- Type: Service bulletin
- NHTSA id: 11027971
- Published by NHTSA: 2026\-02\-02
- Manufacturer's number: WSB\-07
- Manufacturer's date: 2026\-01\-12
- Campaign id or software version: WSB\-07
- NHTSA component: ELECTRICAL SYSTEM; ENGINE

## NHTSA's summary

Tiffin issued a technical service bulletin to change the alternator in the Open Trail Motorhome due to a firmware update by Lithionics to change the secondary alternator charging threshold from 800 to 1200 RPMs.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027971-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11027971-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine

## Vehicles listed

- 2026 TIFFIN OPEN TRAIL

JSON: [/v1/bulletins/11027971](/v1/bulletins/11027971)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%20WSB-07&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11027971&vehicle=Service%20bulletin%20WSB-07)