It's not alternator if I disconnect the plug on battery volt light comes on but charges fine . When pluged in volt go up to 17 - 18 - 19 where is regulator located ? What's it look like?
What makes this problem better or worse?
Charging problem
How long has your 1998 Oldsmobile Aurora had this problem?
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Voltage regulator is inside of the alternator .. Alternator replacement required .. Suggest testing alternator voltage output with a volt meter @ battery.