Question about 2007 Chevrolet Tahoe
Start at the battery and check with a dc volt meter while it is running. A good battery puts out a max of 12.5 volts.... If you have ATLEAST 13.0 volts then your alternator is working, but not at peak efficiency which is more like 14.0 volts. If you detect that it isn't charging the next step is to attach the volt meter directly to the alternator. There should be a "hot wire(s)" meaning it should have a rubber boot over it and usually is red like the wires running to the positive side of the battery. NOT running it should show the same voltage as the battery, with the vehicle running it should be producing above 12.5 volts more like 14 volts. If you DO have that type of voltage (14v) there and not at the battery while it's running then yes the alternator is good and the wiring between the alternator and battery is bad/shorted. Don't be MISLEAD because alternators that are going bad have a tendency to work intermittent. If this is the case don't chance it, REPLACE it
Posted on Oct 12, 2013
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Posted on Jan 02, 2017
SOURCE: alternator not exciting
Hi ' If you changed the battery and alternator,
Check the voltage at the red wire on the alternator. if there a less than 12 volt.
Check the fuse link, that goes in the starter positive bolt.
If the fuse is bad replace and recheck the charging system.
IF charging normal. good.
If not, che the fuse in the fuse box, "" cluster".
If the fuse is blow out, replace. and check again.
OK. I hope this work for you.
Posted on Jul 06, 2008
SOURCE: car battery problem
The alternator test will likely indicate a charging problem from the alternator that is not keeping the battery charged up.
Regardless of the alternator test, it would be best to do an electrical draw test to determine whether there is an excess drain on the battery. This can be done with an ammeter between the positive terminal and the positive battery post. This test is done with key off, all accessories off, no lights on, etc. There will be a small draw on the battery in all newer vehicles, but it should be in the order of up to 50 milliamps. If you are getting more than 200 milliamps of current draw then there is a problem with an electrical system that will drain the battery over a period of days or weeks. Once you know this is true, the electrical systems can be methodically tested.
Posted on Jan 19, 2009
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