Once the warning light turned on, if the generator had failed, the engine would continue to run with the head lights on for around 15 to 60 minutes. (Generator and alternator are the same thing, but to be correct, the term "alternator" was copyrighted by Chrysler). If all of this happened at about the same time, it is likely the generator is not at fault. The engine will run without a working generator until the battery runs down.
You can start the generator testing yourself with an inexpensive digital voltmeter. The testing has to be done while the problem is occurring, to be accurate. Simply measure the battery voltage. It will be 12.6 volts if it's fully-charged, and around 12.2 volts if it's okay but discharged. Next, with the engine running, it must be between 13.75 and 14.75 volts. If it is low, there are more tests to narrow down the cause.
Sunday, February 16th, 2014 AT 8:18 PM