{"nhtsa_id":10011630,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-01-27","date":"2004-12-14","document_id":"18546","mfr_campaign":null,"replaces":"18546R","component":"ELECTRICAL SYSTEM:WIRING","mfr_system":null,"summary":"INSTALL DDEC II TO DDEC IV WIRE HARNESS AND HARDWARE CONVERSION KIT ON 1991-1993 SERIES 60 ON-HIGHWAY MANUAL TRANSMISSION TRUCKS. DETROIT DIESEL INSTALLATION INSTRUCTIONS. 18SP546. REVISION. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10011630","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"wiring","name":"Wiring and fuses","parent":"electrical"}],"codes":[],"topics":[],"vehicles":[{"make":"UNKNOWN","model":"UNKNOWN","year_from":null,"year_to":null,"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":[]}