2025-01-15 · 5 min read
Proton X90 BSG / Alternator Malaysia
X90: 48V Belt Starter Generator (BSG) replaces alternator. BSG belt critical — inspect at 60,000 km. BSG failure: engine cranking + 48V warning. Malaysia BSG replacement: Proton dealer+.
- 48V BSG replaces conventional alternator function; BSG failure: warning lights + loss of mild-hybrid assist; RM 1,800–3,500
Alternator Diagnosis — Proton Malaysia
Always test both battery and alternator together — a failing battery mimics alternator symptoms. A healthy alternator reads 13.8–14.5V at the battery terminals with engine running. Proton VVT alternators are prone to brush wear after 100,000–120,000 km. Remanufactured alternators (RM 300–550) from reputable rebuilders are a cost-effective alternative to OEM units (RM 700–1,200). Check the alternator belt tension at every service.