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  #1  
Old 02-12-2005, 02:18 PM
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Join Date: Feb 2001
Posts: 212
alternator question

Hi guys,
I was just wondering if besides the voltage regulator and the obvious.. bearing, tension from the belt, inside armature continuity, proper rectification...is there anything else that could go wrong with an alternator? If it produces over 13 volts it is working properly, right?
thanks alot,
opossum

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  #2  
Old 02-12-2005, 04:46 PM
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Best basic diagnostic procedure I have seen is in post#5 of the recent thread (today) called "More battery/alternator troubles"

MP
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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  #3  
Old 02-12-2005, 05:56 PM
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Yep,
saw that, read it extensively...Don't know how much that accurately answers my question however.
thanks though!
Opossum
__________________
German autos!!!
'67 250se coupe
'89 190e 2.6
'05 BMW x5
'59 0319 diesel Omnibus.
Italian bikes!!!
'64 Lambretta Special 185 hot rod scooter
'66 Lambretta SX200
'59 Lambretta 250 race bike
'70 Lambretta GP200
'77 860gt ducati
'66 ducati monza
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  #4  
Old 02-12-2005, 10:27 PM
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Join Date: Sep 2004
Location: Seattle
Posts: 1,971
Quote:
Originally Posted by opossum
If it produces over 13 volts it is working properly, right?
thanks alot,
opossum
"The voltage at the battery with the engine running and everything else off and fully charged battery should be 13.0 to 13.8 Volts. Domestic cars will be 14 to 14.8 volts.
With the engine at idle, check for AC voltage. It should be less than 1V. If it is more, than the rectifiers are bad in the alternator. Now back to DC volts at the battery, turn on the lights and the AC fan to high. The voltage will drop but it should stay above 12.5V. Rev the engine to 2000 RPM and the voltage should go back up to 13.0 to 13.8 V. If not, check the alt belt first. It should be tight enought that you can't turn it by hand.(Be careful, it will be hot). If the belt will slip when turning it by hand, it is toooo loose. Tighten it and recheck."
I would say that answers your question about 100% accurately.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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