I've have an 83 Pontiac 6000 STE with what looks like a bad alternator . This is 108 amp Delco SI. The system is not charging - there is only battery voltage at the battery (spec is 13.3 - 14.4 V.) Unfortunately the dash diode and alt lights are not working but the fuse checks ok, The alternator gets hot at the rectifier and whines. The there is a current drain about 500 mA with engine and system off. All cables are clean with 0.1 V drop max at both pos and neg . Alternator Bat terminal to Ground is at battery voltage (11.3V ). Alt terminal 1 is 10.9 V and terminal 2 is 0.8V. Does this indicate a bad diode? If so, is it worth it to repair or is it better to buy a reman. A Delco reman is pretty pricey at $ 170 . Although I would hate to get is a Pep Boys or other box store alternator is about $80 TIA
- posted
16 years ago