2004 Pontiac Montana Q&A
2004 Pontiac Montana Question: check engine lights came on, headlights flashed off, then car shut down.
Probably a failing battery or alternator problem. Need to get both tested and replace the faulty one. Odds are its the alternator. - csubak30
have charging system ck completely incl battery - globalhelper
Most likely your alternator is failing...have shop check for alternator and battery - your.mechanic