Check the voltage at the battery posts with the engine running at a fast idle. If the charging system is working properly it should be between 13.5 and 14.5, depending on the state of charge of the battery. Below 13 is very marginal- - - -below 12 means the generator or alternator is not charging.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!