{"nhtsa_id":11029256,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-03-03","date":"2026-02-20","document_id":"WSB-09","mfr_campaign":"WSB-09","replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029256-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029256-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11029256","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TIFFIN","model":"OPEN TRAIL","year_from":2025,"year_to":2026,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"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.","attribution":[]}