Car alternator voltage too high

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TESTING AN ALTERNATOR WITH A VOLTMETER Put a voltmeter across the battery while the engine is running. Voltage should be 14.2 volts. Lower than 14 volts or higher than 14.4 volts could mean an alternator problem.
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The voltage regulator makes sure the current flowing to the battery does not get too high and ‘cook’ the battery. If the charging voltage is too low in the alternator, the charging system could fail, causing the car to break down. Factors that might affect the charging voltage are drained batteries or worn/loose cables.
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The testing the voltage regulator, my part number is IN220/IN250, I checked the field setting was "A", the voltage was 12V, the set poin Spec was 14.4, when I did the test, the short circuit light was off, warning light was on,field light was falshing and the actual reading was 14.4, so this testing was pass.
If you are using a multimeter, use a voltage source close to the ECM if possible. Fire up the car and hold it at a few thousand RPM. Observe battery voltage – it should be fairly high. (13.8 – 14.5 volts, depending on the vehicle) Gradually, let the car return to idle while keeping an eye on battery voltage. the car's alternator generate an alternating current three-phase. Typically, the components - automobile electrical components using electrical voltage 12 or 24 v olt and the alternator's charging ...
Most stock alternators are in the 80-120 ampere range and can only supply about 40% to 50% of that for non-automotive uses like amplifiers. A 250 or 300 ampere aftermarket high output alternator should provide enough power for all your car's systems and your high-powered stereo too. That will produce maximum output from the alternator for any RPM that allows such, so do not let the voltage get too high at the battery, 14.6 is OK, absolute maximum is 14.9. Occasionally a VR will fail in the Full Maximum Output condition; system voltage will be very excessive. 90% of the time the VR is at fault. As the battery charges and the voltage increases, the sense wire now tells the regulator that the voltage has risen too high so it in turn reduces alternator output to keep it constant. If, for any reason, the external sense wire is not connected to the output of the alternator, the information coming back to the regulator will be incorrect.
The internal voltage regulator monitors the alternator output and reports it to the ECM. If the actual voltage didn’t match the commanded output, the ECM sets a P0562 (P1297) voltage too low or PP1549 for voltage too high. If the alternator doesn’t charge at all, the ECM sets a P056A for No Charging Malfunction. Jul 12, 2012 · Battery damage begins when the internal temperature becomes too high, causing it to gas and heat up. If it feels warm to the touch or if you're smelling gas, it's getting too hot. A smart voltage regulator for the alternator should control and taper off the charge to prevent this and can also be set, within limitations, to accommodate your needs.
If the alternator voltage output is high you'll get: An unpleasant, sulfur smell from the car battery Headlight lamp bulbs tend to burn out more than usual. Also can cause unusual behavior with car electronics.Hi everyone, picked up my first ever jag today, 2003 2.1 v6 sport, and the alternator warning came on. My local garage which I trust, tested it and surprised me when they told me it was sending too much voltage charge to the battery (over 15).
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