# Service bulletin WSB\-09

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: 11029256
- Published by NHTSA: 2026\-03\-03
- Manufacturer's number: WSB\-09
- Manufacturer's date: 2026\-02\-20
- Campaign id or software version: WSB\-09
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

Tiffin Motorhomes issued a technical service bulletin for Open Trail Motorhomes with a 51V battery system and a hydronic heating system. It was found that operating the hydronic heating system on the diesel burner would cause a temporary overload of the electrical system which would shut down. To solve this issue, 2 new DC\-DC converters are being installed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029256-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11029256-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2025 to 2026 TIFFIN OPEN TRAIL

JSON: [/v1/bulletins/11029256](/v1/bulletins/11029256)

[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-09&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11029256&vehicle=Service%20bulletin%20WSB-09)