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1980 Brat charging issues
Posted 06 February 2013 - 01:54 PM
Posted 06 February 2013 - 02:09 PM
Your 80 should have an external reg.
The original ones are adjustable,but,you do not want to go there.
Alternator probably just needs brushes.
$40 is pretty cheap,but,if you are on a tight budget,just replace the brushes.
Posted 06 February 2013 - 05:55 PM
Edited by mikaleda, 06 February 2013 - 06:00 PM.
Posted 08 February 2013 - 01:26 PM
If you have a voltmeter set it to DC. Place the red probe to the positive on th battery and the black probe to the negative while the engine is idling. Idle should be 800-900 RPM's and you should be seeing about 14 volts at your voltmeter and not fluctuating. If you see less than 14 your alternator is not putting out proper charge and needs to be replaced. With the probes still attached to the battery rev the engine to say 2500 or so RPM's and watch the needle. If it starts to flucuate you probably have a bad regulator. If the needle goes up and doesn't fluctuate then as others said the brushes are probably worn and need replacing. As far as whether to replace brushes of the whole alternator I suggest replace the whole alternator. If you can get a whole one for $40 that's not too bad, probably comes with a warrany and is a much quicker replacement to swap out alternators than replacing brushes.
Another alternator test, that I do not endorse as it has been said it can damage the charging circuit on a car, is to remove th positive cable from the positive post on the battery while it is running. If the car dies you have a bad alternator. If it continues to run then you have a good alternator. Like I say do this at your own risk and depending on how brave you feel. They say is can cause damage to the car. I have done it many times and nothing has happened to me but maybe I am just lucky.
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