Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
SF-393-AB
FREIGHTLINER (WESTERN STAR 4900): BATTERY DISCONNECT SWITCHES-SANJEL CORP. ONLY. THE WIRING FOR THE BATTERY DISCONNECT SWITCH IS NOT CONSISTENT AMONG VEHICLES. EXISTING BATTERY DISCONNECT SWITCHES WILL BE REPLACED. CSC LETTER WAS RECEIVED. *PE
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.