Originally posted by Car Nut
Is it okay to have 15V output on the Alternator? My 1987 Pontiac 6000LE V6 battery light is on intermittently. I changed the battery already, but the light is still on intermittently.
15V seems a bit high (14.4 or so is nominal, as previously posted).
I had my regulator fail on my W124 once, overcharging so badly the battery was gassing! A quick voltmeter measurement showed 17.5V at the battery terminals!!!