Posted by old on February 24, 2011 at 16:46:25 from (4.245.9.199):
In Reply to: Checking an alternator posted by charlie M on February 24, 2011 at 16:29:52:
Best way and the only safe way is to use a volt meter. Check battery voltage with out the engine running first. You should get 12 volts maybe a tad bit more. Then start the engine and and recheck and you should see 13-14 volts give or take a little bit. If you do not get those 2 readings then you have a problem. If battery volts do not read 12 plus then you have a low battery of a bad battery. If when running you do not get 13 plus then the charging system has a problem. DO NOT pull a battery cable off with it running to check it can/will kill the alternator or could also kill you
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