1993 Subaru Legacy Q&A

1993 Subaru Legacy Question: altenator seems to work when it wants to no batt light comes on.

so the car runs on the batt untill its dead.no batt light comes on so i dont know.had rebuilt ok for a while but still does it.how can this happen without batt light coming on?checked wires ok fuses ok battery good untill it killed it.anybody know whats going on here? -
Answer 1
"seems to work when it wants to" -----HOW are you testing the charging system and are you testing it when the battery is FULLY charged? -