{"nhtsa_id":11027971,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-02-02","date":"2026-01-12","document_id":"WSB-07","mfr_campaign":"WSB-07","replaces":null,"component":"ELECTRICAL SYSTEM; ENGINE","mfr_system":null,"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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11027971-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11027971-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11027971","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TIFFIN","model":"OPEN TRAIL","year_from":2026,"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":[]}