 alternator dead ??? |
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| SirAndy |
  Jan 16 2006, 11:23 AM
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#1
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Resident German  Group: Admin Posts: 42,479 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California  |
my volt-meter dropped to ~10V while driving, dead battery i thought ...
i measured the battery with the car turned off, 12.5V on the terminals. i started the car, 11.5V on the terminals. checked at the alternator, 11.5V ... alternator dying ??? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif) Andy |
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| r_towle |
Jan 16 2006, 01:13 PM
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#2
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Andy,
Go to Sears and have them put an AMP test on your battery. It is called a battery load test. A volt test will not tell you the real condition of the battery under load. Usually the test is free. I would not trust the volt meter in the car either...I think its a rough guess and is meant to alert you to a change in condition. If your battery test out fine, follow the wire from the alternator to the relay board... Stick a volt meter tester on the alternator side of the relay board..you have to leave it plugged in while doing this... My dad taught me a great trick for this... Take two pin (sewing pins) and push them through the insulation of the wires...then you can test the alternator while the car is running. It should produce alot more than 12 volts...I am not sure of the spec. If that tests ok, and you are still getting less than 13-14 volts at the battery while running, its is a bad voltage regulator... I'll give you Dad's laymans terms...how he taught me... The battery is designed to hold 12.75 volts. in order to obtain that voltage, you must pour more than that into the battery all the time while charging... So, your charging circuit should always be above what your battery is in a standing state, in this case 12.5-12.75 volts. I have found that all I needed to do sometimes is take the voltage regulator off, clean the terminals, and put it back, bingo, all is well again... Take a look, mine was all green and corroded. Rich |
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Posts in this topic
SirAndy alternator dead ??? Jan 16 2006, 11:23 AM
Joe Sharp Andy: Check voltage before the regulator, should b... Jan 16 2006, 11:30 AM SLITS Es ist tot meine Furher................... Jan 16 2006, 11:31 AM dmenche914 12.5 is a bit low for a battery. I'd first tr... Jan 16 2006, 11:38 AM lapuwali I disagree. 12.5v for a battery w/o the alternato... Jan 16 2006, 11:48 AM dmenche914 Per offical VW manual 1970-1978 for Bug Ghis, etc.... Jan 16 2006, 12:40 PM SLITS A charged battery will see 12.5 volts...if checked... Jan 16 2006, 01:04 PM
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