Carolinacarconnection is correct about the problem not being related to the alternator. At least the symptoms don't seem to point to that. But it is also possible as alternators can be working but the charging is insufficiet to get the battery fully charged and this can cause intermittent non starting due to a weak battery. Do as suggest, get the charging system tested correctly.
For vehicles of yesteryears you can disconnect the alternator to test but that is not the correct way. A voltmeter across the battery terminals would tell you if the charging is correct.
For modern vehicles, they are equipped with a lot of electronic components and power surge can fry any of the control units. They can be costly to replace.
Alternators can go out any time and sometimes they can be intermittent. Without proper testing techniques, you would not know.
You have been warned against unhooking the battery with engine running and if you wish to do that again, there is nothing we can do about it.
Thursday, August 9th, 2012 AT 12:41 PM