01-13-2014, 11:05 PM
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Registered User
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Join Date: Jul 2009
Posts: 19
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Alternator Puzzler 1987 300E
- 1987 300E
- 1-year-old battery
- 3rd re-man alternator + 4th new voltage regulator
- Battery voltage at full charge - 12.4 V
- Voltage indicated at the battery terminals with engine on but no electrical load - 13.6 V
- Voltage indicated at the battery terminals with engine on with all accessories on - 11.6 V and steadily drops until the battery loses all charge
- Bench test of all alternators shows normal alternator, diode and voltage regulator function;
- Diagnostic tester with alternator installed and engine operating without an electrical load shows normal alternator, diode and voltage regulator functions;
- Diagnostic tester with alternator installed and engine operating with all accessories engaged shows normal alternator and diode but a failed voltage regulator function (4th new voltage regulator).
Any ideas?
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